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Question: Answered & Verified by Expert
A shell in air explodes into n equal fragments, k of the fragments reach the ground earlier than the other fragments. The acceleration of their centre of mass subsequently will be
PhysicsCenter of Mass Momentum and CollisionJEE Main
Options:
  • A g
  • B n-kg
  • C n-kgk
  • D n-kng
Solution:
1804 Upvotes Verified Answer
The correct answer is: n-kng
acm=ΣmiaiΣmi

Till all the particle remains in air center of mass remains stationary. When k particles hit the ground then center of mass shifts with accelaration :

acm=n-kng

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