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Question

A 0.5 kg ball moving with a speed of 12 m/s strikes a hard wal at an angle of 30owith the wall. It is reflected with the same speed and at the same angle. If the ball is in contact with the wall for 0.25 seconds, the average force acting on the wall is:-

A
96 N
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B
48 N
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C
24 N
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D
12 N
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Solution

The correct option is C 24 N

Accordingtoquestion.............Δp=OBsin300(OAsin300)whereΔpischangeinmomentum.Δp=mvsin300(mvsin300)=2mvsin300F×t=2mvsin300F=2mvsin300twhere,m=0.5kg,v=12m/s,t=0.25sso,F=2×0.5×12×sin3000.25=24N24NsothattheoptionisC.


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