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Q.

A ball of mass 10 gm dropped from a height of 5m hits the floor and rebounds to a height of 1.25m. If the ball is in contact with the ground for 0.1s, the force exerted by the ground on the ball is (g=10 m/s2)

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a

0.5 N

b

1.5 N

c

0.15N

d

2.5 N

answer is B.

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Detailed Solution

F=dpdt=m(v−u)t where v=2gh2,u=2gh1
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