posted by shay .
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
Answer in units of m/s
How long will the ball take to reach its starting
Answer in units of s
Vfinal = Vinitial
(Consider conservation of energy)
Time (up and down)
= 2*7.5/9.8 = ___ s