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Q.

A ball of mass 0.2kg is thrown normally against a wall with a speed of 20ms-1. It rebounds  normally with a speed of   15ms-1.then impulse by the ball on the wall is

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a

0.7 Ns

b

7 Ns

c

0.35 Ns

d

70 Ns

answer is C.

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Detailed Solution

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v=15m/s,u=−20m/s,m=0.2kg

 Impulse =pf−pi

=mv−mu=m(v−u)

=0.2(15−(−20))=0.2(15+20)=0.2(35)

=210×35=7Ns

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