Question 1

A laser is thrown upward with a speed of  12 m/s on the surface of planet X where the acceleration due to gravity is  and there is no atmosphere. How long does it take for the laser to reach the maximum height?
A)  16 s
B)  11 s
C)  14 s
D)  8.0 s

Accepted Answer

The answer of A laser is thrown upward with a...

Question 2

A ball is projected upward at time t = 0 s, from a point on a flat roof 90 m above the ground. The ball rises and then falls with insignificant air resistance, missing the roof, and strikes the ground.
The initial velocity of the ball is 80.5 m/s. Consider all quantities as positive in the upward
Direction. The vertical velocity of the ball when it is 89 m above the ground is closest to
A) -81 m/s.
B) -48 m/s.
C) -32 m/s.
D) -64 m/s.
E) -97 m/s.

Accepted Answer

The correct answer is A because the ball is projected upward with an initial velocity of 80.5 m/s, and it rises to a maximum height of 90 m above the ground. The ball then falls with insignificant air resistance, and its vertical velocity when it is 89 m above the ground is closest to -81 m/s.

Question 3

A car is traveling with a constant speed of  30.0 m/s when the driver suddenly applies the brakes, causing the car to slow down with a constant acceleration. The car comes to a stop in a distance of  120 m. What was the acceleration of the car as it slowed down?
A) 
B) 
C) 
D) 
E)

Accepted Answer

The answer of A car is traveling with a constant...

Question 4

A car is traveling with a constant speed when the driver suddenly applies the brakes, causing the car to slow down with a constant acceleration of magnitude 3.  . If the car comes to a stop in
A distance of 30.0 m, what was the car's original speed?
A) 10.2 m/s
B) 14.5 m/s
C) 315 m/s
D) 105 m/s
E) 210 m/s

Accepted Answer

The answer of A car is traveling with a constant...

Question 5

A ball is thrown downward from the top of a building with an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the building, assuming negligible air resistance?
A) 30 m
B) 70 m
C) 20 m
D) 50 m

Accepted Answer

The height of the building can be found using the equation $y = v_0t + \frac{1}{2}gt^2$, where $y$ is the height, $v_0$ is the initial velocity (25 m/s downward), $t$ is the time (2.0 s), and $g$ is the acceleration due to gravity (approximately 9.8 m/s$^2$ downward). Plugging in the values, we get $y = 25(2) + \frac{1}{2}(9.8)(2)^2 = 50 + 19.6 = 69.6$ m, which rounds to 70 m.

Question 6

A ball is thrown straight up with a speed of 30 m/s, and air resistance is negligible.
(a) How long does it take the ball to reach the maximum height?
(b) What is the maximum height reached by the ball?
(c) What is its speed after 4.2 s?

Accepted Answer

The answer of A ball is thrown straight up with...

Question 7

A test rocket at ground level is fired straight up from rest with a net upward acceleration of 20 m/s². After 4.0 s, the motor turns off but the rocket continues to coast upward with insignificant air
Resistance. What maximum elevation does the rocket reach?
A) 330 m
B) 320 m
C) 490 m
D) 410 m
E) 160 m

Accepted Answer

The answer of A test rocket at ground level is...

Question 8

A ball is thrown straight up with a speed of 36 m/s. How long does it take to return to its starting point, assuming negligible air resistance?
A) 7.3 s
B) 3.7 s
C) 15 s
D) 11 s

Accepted Answer

The time it takes for an object thrown straight up to return to its starting point can be calculated using the formula $t = \frac{2v}{g}$, where $v$ is the initial velocity and $g$ is the acceleration due to gravity (approximately $9.8 \, \text{m/s}^2$). Plugging in the given values, $t = \frac{2 \times 36}{9.8} \approx 7.3 \, \text{s}$.

Question 9

A laser is thrown upward with a speed of  12 m/s on the surface of planet  X  where the acceleration due to gravity is  and there is no atmosphere. What is the maximum height reached by the laser?
A)  8.0 m
B)  144 m
C)  48 m
D)  18 m

Accepted Answer

The answer of A laser is thrown upward with a...

Question 10

An instrument is thrown upward with a speed of  15 m/s on the surface of planet  X  where the acceleration due to gravity is  and there is no atmosphere. How long does it take for the instrument to return to where it was thrown?
A)  12 s
B)  6.0 s
C)  10 s
D)  8.0 s

Accepted Answer

The answer of An instrument is thrown upward with a...

Question 11

Human reaction time is usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it,
Assuming negligible air resistance?
A) At least 6.8 cm
B) At least 9.8 cm
C) At least 3.0 cm
D) At least 4.9 cm

Accepted Answer

The answer of Human reaction time is usually greater than...

Question 12

A stone is thrown with an initial upward velocity of 7.0 m/s and experiences negligible air resistance. If we take upward as the positive direction, what is the velocity of the stone after 0.50 s? 
A)  0.00 m/s
B)  2.1 m/s
C)  -4.9 m/s
D)  4.9 m/s
E)  -2.1 m/s

Accepted Answer

The answer of A stone is thrown with an initial...

Question 13

A hammer is thrown upward with a speed of  14 m/s on the surface of planet  X  where the acceleration due to gravity is  and there is no atmosphere. What is the speed of the hammer after  8.0 s?
A)  64 m/s
B)  14 m/s
C)  21 m/s
D)  7.0 m/s

Accepted Answer

The answer of A hammer is thrown upward with a...

Question 14

A bullet shot straight up returns to its starting point in 10 s. What is the initial speed of the bullet, assuming negligible air resistance?
A) 25 m/s
B) 49 m/s
C) 9.8 m/s
D) 98 m/s

Accepted Answer

The bullet takes 10 seconds for the entire trip, so it takes 5 seconds to reach the maximum height. Using the formula $v = gt$, where $g = 9.8 \, \text{m/s}^2$ is the acceleration due to gravity and $t = 5 \, \text{s}$, we find the initial speed $v = 9.8 \times 5 = 49 \, \text{m/s}$.

Question 15

An astronaut on a strange new planet having no atmosphere finds that she can jump up to
a maximum height of 27 m when her initial upward speed is 6.0 m/s. What is the
magnitude of the acceleration due to gravity on the planet?

Accepted Answer

The answer of An astronaut on a strange new planet...

Question 16

A foul ball is hit straight up into the air with a speed of 30 m/s, and air resistance is
negligible.
(a) Calculate the time required for the ball to rise to its maximum height.
(b) Calculate the maximum height reached by the ball above the point where it hit the bat.
(c) Determine the times at which the ball passes a point 25 m above the point where it was
hit by the bat.
(d) Explain why there are two answers to part (c).

Accepted Answer

The answer of A foul ball is hit straight up...

Question 17

Car  A  is traveling at  22.0 m/s and car  B  at  29.0 m/s. Car  A  is  300 m behind car  B  when the driver of car  A  accelerates his car with a uniform forward acceleration of 
How long after car  A  begins to accelerate does it take car  A  to overtake car  B  ?
A)  5.50 s
B)  19.0 s
C)  316 s
D)  12.6 s
E) Car A never overtakes car B.

Accepted Answer

The answer of Car  A  is traveling at...

Question 18

A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3.0 s, assuming negligible air resistance?
A) 19.6 m/s downward
B) 0 m/s
C) 9.8 m/s upward
D) 9.8 m/s downward

Accepted Answer

The velocity of the ball after 3.0 s can be calculated using the formula v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration (due to gravity, which is -9.8 m/s^2, indicating a downward acceleration), and t is the time. Substituting the given values: v = 19.6 m/s + (-9.8 m/s^2)(3.0 s) = 19.6 m/s - 29.4 m/s = -9.8 m/s. The negative sign indicates the direction is downward, so the velocity is 9.8 m/s downward.

Question 19

A car is traveling at  26.0 m/s when the driver suddenly applies the brakes, causing the car to slow down with constant acceleration. The car comes to a stop in a distance of  120 m. How fast was the car moving when it was  60.0 m  past the point where the brakes were applied?
A)  22.5 m/s
B)  12.1 m/s
C)  15.0 m/s
D)  18.4 m/s
E)  9.20 m/s

Accepted Answer

To find the speed of the car after it has traveled 60.0 m, we can use the equation derived from the kinematic equations for constant acceleration, $v^2 = u^2 + 2as$, where $v$ is the final velocity, $u$ is the initial velocity, $a$ is the acceleration, and $s$ is the distance. Since the car comes to a stop, $v = 0$ when $s = 120$ m. Rearranging the equation to solve for $a$, we get $a = -\frac{u^2}{2s}$. Plugging in the values, $a = -\frac{(26.0)^2}{2(120)}$. Then, to find the speed at 60.0 m, we use the same equation with $s = 60.0$ m and solve for $v$, resulting in $v = \sqrt{u^2 + 2as}$. Substituting the calculated acceleration and the given values, we find that $v$ is approximately 18.4 m/s.

Question 20

A ball is projected upward at time t = 0 s, from a point on a flat roof 10 m above the ground. The ball rises and then falls with insignificant air resistance, missing the roof, and strikes the ground.
The initial velocity of the ball is 58.5 m/s. Consider all quantities as positive in the upward
Direction. At time t = 5.97 s, the vertical velocity of the ball is closest to
A) 0 m/s.
B) +12 m/s.
C) -12 m/s.
D) -175 m/s.
E) +175 m/s.

Accepted Answer

At the highest point of the trajectory, the vertical velocity of the ball is 0 m/s.

Quiz 2: Describing Motion: Kinematics in One Dimension

A laser is thrown upward with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity is and there is no atmosphere. How long does it take for the laser to reach the maximum height?

A car is traveling with a constant speed of 30.0 m/s when the driver suddenly applies the brakes, causing the car to slow down with a constant acceleration. The car comes to a stop in a distance of 120 m. What was the acceleration of the car as it slowed down?

A car is traveling with a constant speed when the driver suddenly applies the brakes, causing the car to slow down with a constant acceleration of magnitude 3. . If the car comes to a stop in A distance of 30.0 m, what was the car's original speed?

A ball is thrown downward from the top of a building with an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the building, assuming negligible air resistance?

A ball is thrown straight up with a speed of 30 m/s, and air resistance is negligible. (a) How long does it take the ball to reach the maximum height? (b) What is the maximum height reached by the ball? (c) What is its speed after 4.2 s?

A test rocket at ground level is fired straight up from rest with a net upward acceleration of 20 m/s². After 4.0 s, the motor turns off but the rocket continues to coast upward with insignificant air Resistance. What maximum elevation does the rocket reach?

A ball is thrown straight up with a speed of 36 m/s. How long does it take to return to its starting point, assuming negligible air resistance?

A laser is thrown upward with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity is and there is no atmosphere. What is the maximum height reached by the laser?

An instrument is thrown upward with a speed of 15 m/s on the surface of planet X where the acceleration due to gravity is and there is no atmosphere. How long does it take for the instrument to return to where it was thrown?

Human reaction time is usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it, Assuming negligible air resistance?

A stone is thrown with an initial upward velocity of 7.0 m/s and experiences negligible air resistance. If we take upward as the positive direction, what is the velocity of the stone after 0.50 s?

A hammer is thrown upward with a speed of 14 m/s on the surface of planet X where the acceleration due to gravity is and there is no atmosphere. What is the speed of the hammer after 8.0 s?

A bullet shot straight up returns to its starting point in 10 s. What is the initial speed of the bullet, assuming negligible air resistance?

An astronaut on a strange new planet having no atmosphere finds that she can jump up to a maximum height of 27 m when her initial upward speed is 6.0 m/s. What is the magnitude of the acceleration due to gravity on the planet?

Car A is traveling at 22.0 m/s and car B at 29.0 m/s. Car A is 300 m behind car B when the driver of car A accelerates his car with a uniform forward acceleration of How long after car A begins to accelerate does it take car A to overtake car B ?

A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3.0 s, assuming negligible air resistance?

A car is traveling at 26.0 m/s when the driver suddenly applies the brakes, causing the car to slow down with constant acceleration. The car comes to a stop in a distance of 120 m. How fast was the car moving when it was 60.0 m past the point where the brakes were applied?