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Question

A ball weighing 10gm hits a hard surface vertically with a speed of 5m/s and rebounds with the same speed. The ball remain in contact with the surface for 0.01 sec. The average force exerted by the surface on the ball is

A
100N
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B
10N
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C
1N
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D
150N
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Solution

The correct option is B 10N
As after rebounds speed didn't change so change in momentum will be just double of the initial momentum i.e., Δp=mΔv=.01×10=0.1Kgm/s
Average Force will be Δp/Δt=10N
Option B is correct.

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