At one instant an object in free fall is moving downward at 50 m/s. One second later its speed is
A)25 m/s.
B)50 m/s.
C)55 m/s.
D)60 m/s.
E)100 m/s.

Question

Quizplus · Accepted Answer

In free fall, the object experiences a constant acceleration of 9.8 m/s^2 downwards. Using the formula for constant acceleration:

v = u + at

where v is final velocity, u is initial velocity, a is acceleration, and t is time.

We can calculate the final velocity after 1 second:

v = 50 m/s + (9.8 m/s^2)(1 s) 
v = 59.8 m/s

Therefore, the closest answer choice is D) 60 m/s.

At One Instant an Object in Free Fall Is Moving