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Q.

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

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a

0.5 N

b

1.5 N

c

0.15 N

d

2.5 N

answer is B.

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Detailed Solution

F=m(2gh1+2gh2)t      =10×10−3(2×10×5+2×10×1.25)0.1      =10−1(10+5)      =10−1(15)      =1.5N
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