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Two blocks of masses 10 kg and 4 kg are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of 14 m/s to the heavier block in the direction of the lighter block. The velocity of the centre of mass is
  • a)
    30 m/s
  • b)
    20 m/s
  • c)
    10 m/s
  • d)
    5 m/s
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Two blocks of masses 10 kg and 4 kg are connected by a spring of negli...
Just after collision
Note : Spring force is an internal force, it cannot change the linear momentum of the (two mass + spring) system.
Therefore vc remains the same.
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Two blocks of masses 10 kg and 4 kg are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of 14 m/s to the heavier block in the direction of the lighter block. The velocity of the centre of mass isa)30 m/sb)20 m/sc)10 m/sd)5 m/sCorrect answer is option 'C'. Can you explain this answer?
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