Q.

A ball of mass m moves with speed v and it strikes normally with a wall and reflected back normally, if its time of contact with wall is t then find force exerted by ball on wall

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a

2mvt

b

mvt

c

mvt

d

mv2t

answer is A.

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Detailed Solution

For exerted by ball on wall = rate of change in momentum of ball =mv−(−mv)t=2mvt
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