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Question

A rigid body rotates with an angular momentum L . If its rotational kinetic energy is made 4 times, its momentum will become
  1. L
  2. 16 L
  3. 2 L
  4. 2L


Solution

The correct option is D 2L
we know that L=Iω   K.E=K=12Iω2L2=I2ω2then k=L22I 
L=2KI,L1L2=K1K2LK,Lf=2L

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