# physics

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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
.

How long will the ball take to reach its starting
point?

• physics -

Vfinal = Vinitial
(Consider conservation of energy)

Time (up and down)
= 2*Vinitial/g
= 2*7.5/9.8 = ___ s

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