Jane spikes a volleyball (m=250g ) for 0.02 sec. a net horizontal of 200 N is ap

Question

Jane spikes a volleyball (m=250g ) for 0.02 sec. a net horizontal of 200 N is applied tot the volleyball . (A) if the final velocity of the ball is 20 m/s what is the initial velocity of the ball ? (B) if the final velocity of the ball is is 12 m/s , what is the initial velocity of the ball ? Jane spikes a volleyball (m=250g ) for 0.02 sec. a net horizontal of 200 N is applied tot the volleyball . (A) if the final velocity of the ball is 20 m/s what is the initial velocity of the ball ? (B) if the final velocity of the ball is is 12 m/s , what is the initial velocity of the ball ?

Explanation / Answer

Using force- impulse relationship

Ft= m(v-u)

A.

200*0.02= 0.25*( 20-u)

u= 4 m/s

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B. 200*0.02= 0.25*( 12-u)

u= - 4 m/s

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Comment in case any doubt..goodluck

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