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Question: Answered & Verified by Expert
A heavy truck moving with a velocity of $60 \mathrm{~km} \mathrm{~h}^{-1}$ collides with a light drum at rest. If the collision be elastic, then the velocity of the drum immediately after collision will be
PhysicsCenter of Mass Momentum and CollisionAIIMSAIIMS 2014
Options:
  • A zero
  • B $60 \mathrm{~km} \mathrm{~h}^{-1}$
  • C $120 \mathrm{~km} \mathrm{~h}^{-1}$
  • D uncertain
Solution:
2211 Upvotes Verified Answer
The correct answer is: $120 \mathrm{~km} \mathrm{~h}^{-1}$
In an elastic collision of a very heavy body with a very light body at rest, the speed of lighter body becomes twice the speed of the heavier body, i.e., $v_2=2 u_1=120 \mathrm{~km} \mathrm{~h}^{-1}$.

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