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Q.

A ball of mass 0.5kg moving with a velocity of 2m/sec strikes a wall normally and bounces back with the same speed. If the time of contact between the ball and the wall is one millisecond, the average force will be

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a

125 N

b

2000 N

c

5000 N

d

1000 N

answer is A.

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Detailed Solution

F=mv−−mvt=2mVt=2×0.5×21×10−3=2000N

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