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Q.

A body of mass 1kg is dropped from a height of 5m on to the ground.If the body penetrates 2cm in to the ground, the average resistance offered by the ground on to the body is (g = 10ms–2)

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a

2510 N

b

35 N

c

50.2 N

d

2500 N

answer is A.

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Detailed Solution

Just before the body touches the ground, its kinetic energy . when the body is penetrating the ground, net downward force acting on the body = (mg - R). By work-energy Theorem
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