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Q.

A ball of mas s m moving with a velocity u rebounds from a wall. The collision is assumed to be elastic and the force of interaction between the ball and wall varies as shown in the figure. Then the value of F0 is

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a

mu/T

b

2 mu/T

c

4 mu/T

d

mu/2 T

answer is C.

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Detailed Solution

Area under the force-time graph is impulse, and impulse is change in momentum.Area of graph + change in momentum⇒ 12TF0=2mu⇒F0=4muT
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