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 A moving block having mass m, collides with another stationary block having mass 4m. The lighter block comes to rest after collision. When the initial velocity of the lighter block is V. Then the value of coefficient restitution will be

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a
0.8
b
0.25
c
0.5
d
0.4

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detailed solution

Correct option is B

From law of conservation of linear momentum 

mV+4m0=m×0+4mV1

mV=4mV1

V1=V4

e=V1V=V4V=14=0.25

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