A moving block having mass m , collides with another stationary block having mass 4 m . The lighter block…

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
  1. 0.8
  2. 0.25
  3. 0.5
  4. 0.4

Solution

By conversation of linear momentum
mv=4mvv=v4
Coefficient of restitution ( e ) =Velocity of separationVelocity of approach
= v4-0v-0=14=0.25

Asked in: NEET 2018

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