Question
Asked Dec 20, 2019
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A ball is hit with a racquet, causing it to travel straight upward. It takes 2.90 s for the ball to reach its maximum height after being hit. Treat upward as the positive direction.
(a)
What is the ball's initial velocity (in m/s), just after it is hit?
 m/s upward
(b)
What height (in m) does it reach above the level where it was hit?
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Expert Answer

Step 1

Step 1

Kinematic equations are the equations which show relationship between displacement, velocity, acceleration and time.

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h =? Yo = 0 a = -9.8 m/s² =? V, = 0m/s t = 2.90s

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Step 2

Step 2

a)

Initial velocity

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V, =1, + at 0 = v, +(-9.8)(2.90) , = 28.42 m/s

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Step 3

Step 3

b)

The height it re...

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at V; = Yo +Vot +- -9.8x 3? h =0+ 28.42 × 3+ h = 41.61m

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