A tennis ball is shot vertically upward in an evacuated chamber inside a tower with an initial speed of 20.0 m/s at time t = 0 s.
-Determine the velocity of the ball at t = 3.00 seconds.
A)9.40 m/s, downward
B)9.40 m/s, upward
C)29.4 m/s, downward
D)38.8 m/s, upward
E)38.8 m/s, downward

Question

Quizplus · Accepted Answer

The acceleration due to gravity is g = 9.8 m/s^2 downward. The initial velocity is 20.0 m/s upward. At t = 3.00 seconds, the velocity of the ball is:v = u + atv = 20.0 m/s - (9.8 m/s^2)(3.00 s)v = 9.40 m/s downward

A Tennis Ball Is Shot Vertically Upward in an Evacuated