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Question

A ball of mass 'm' moves with speed 'v' and it strikes normally with a wall and reflects back.If its time of contact with wall is t, then find force exerted by ball on the wall

A
2mvt
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B
mvt
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C
mvt
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D
mv2t
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Solution

The correct option is A 2mvt
The linear momentum of the ball before collision was p1=mv
after collision its direction was got reversed but with same speed so the new momentum will be p2=mv
so the change in momentum will be Δp=p2p1=mvmv=2mv
So the force exerted will be F=Δptime=2mvt
whose magnitude
is 2mvt so option A is correct.

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