Home Physics Work, Energy, Power and Collision Conservation of Energy and Momentum A block of mass 1 kg is pushed towards anoth…
Physics Work, Energy, Power and Collision Conservation of Energy and Momentum MCQ (Single Correct)

A block of mass 1 kg is pushed towards another block of mass 2 kg from 6 m distance as shown in figure. Just after collision velocity of 2 kg block becomes 4 m/s.

A
coefficient of restitution between two blocks is 1
B
coefficient of restitution between two blocks is ½
C
velocity of centre of mass after 2 s is 2 m/s
D
velocity of centre of mass after 2 s is 1 m/s

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The correct answer is:
CHECK THE SOLUTION.

(a, c)

From conservation of linear momentum,

velocity of 1 kg block just after the collision is 2m/sec.

After the collision relative velocity of

approach = 6 m/sec,

Relative velocity of separation = 6 m/sec

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