A ball is shot straight up from the surface of the earth with an initial speed of 19.6 m/s. Neglect any effects due to air resistance.
-How much time elapses between the throwing of the ball and its return to the original launch point?
A)4.00 s
B)2.00 s
C)12.0 s
D)8.00 s
E)16.0 s

Question

A ball is shot straight up from the surface of the earth with an initial speed of 19.6 m/s.  Neglect any effects due to air resistance.
-How much time elapses between the throwing of the ball and its return to the original launch point?
A)4.00 s
B)2.00 s
C)12.0 s
D)8.00 s
E)16.0 s

Quizplus · Accepted Answer

The time to reach the maximum height is given by t = v/g, where v is the initial velocity (19.6 m/s) and g is the acceleration due to gravity (9.8 m/s²). So, t = 19.6/9.8 = 2 s. The total time for the round trip is twice this, so 2 * 2 = 4 s.

A Ball Is Shot Straight Up from the Surface of the Earth