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Q.

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 of restitution (e) will be

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a

0.5

b

0.25

c

0.4

d

0.8

answer is B.

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Detailed Solution

m1 = m , m2 =4m , u1 = v , u2 = 0 , v1 = 0Alternative Method :-m X 0 + 4 m X V2 = m X V + 4m X 0⇒ V2 = V / 4
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