A bullet in motion hits and gets embedded in a solid block resting on a frictionless table. What is conserved?
A
Momentum and KE
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B
Kinetic energy alone
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C
Neither KE nor momentum
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D
Momentum alone
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Solution
The correct option is D Momentum alone Since no external force is acting on the bullet + solid block system, thus linear momentum of the system is conserved.
Also, it is an perfectly inelastic collision. So, kinetic energy is not conserved as some kinetic energy is lost as heat in perfectly inelastic collision.