Question

13. You throw a ball vertically upward, and as it leaves your hand, its speed is 37.0 m/s. How long (in s) does the ball take to return to the level where it left your hand after it reaches its highest point? (A) 1.38 seconds (B) 2.28 seconds (C) 3.78 seconds (D) 4.38 seconds (E) 5.18 seconds

Answer 1

Answer:

(C) 3.78 seconds

Explanation:

At the highest point, the velocity is equal to 0m/s

$v_{f}=v_{o}-gt$

$t=\frac{v_{o}}{g}$  ; t is the time to reach the highest point

The  time the ball takes to return to its starting point after the ball  reach its maximum height is the same:

$T_{descent}=t=\frac{v_{o}}{g}=\frac{37}{9.81}=3.78s$