A moving block having mass \( m \), collides with another stationary block having mass \( 4 \mat...

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A moving block having mass \( m \), collides with another stationary block having mass \( 4 \mathrm{~m} \). 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
[NEET 2018]
(a) \( 0.5 \)
(b) \( 0.25 \)
(c) \( 0.8 \)
(d) \( 0.4 \)
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