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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