Question

A tennis ball is thrown vertically upward with
an initial velocity of +7.5 m/s.
What will the ball’s velocity be when it
returns to its starting point? The acceleration
of gravity is 9.81 m/s
2
.
Answer in units of m/s.

Answer 1

V = Vo + g*Tr = 0.
Tr = -Vo/g = -7.5/-9.81 = 0.77 s. = Rise
time.

Tf = Tr = 0.77 s. = Fall time.

V = Vo + g*Tf.
Vo = 0.
g = 9.81.
V = ?.

Answer 2

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