Physics
posted by Eli .
A tennis ball is thrown vertically upward with an initial velocity of +8.0 m/s.
a. what will the ball's speed be when it returns to its starting point?
b. how long will the ball take to reach its starting point?

a. The same speed, downward.
b. hf=hi+vi*time  1/2 g time^2
hf, hi are the same: zero. Find time. 
a.) 8.0m/s
b.)1.63s
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