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When a bullet hits a solid block and gets embedded into it. What is conserved?

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+1 vote
in Fluid Mechanics by (118k points)
When a bullet hits a solid block and gets embedded into it. What is conserved?

(a) Momentum only

(b) Kinetic energy only

(c) Momentum and kinetic energy

(d) Mass

I got this question in a national level competition.

Query is from Kinetic Energy Correction and Momentum Correction Factors topic in portion Viscous Flow & Turbulent Flow of Fluid Mechanics

1 Answer

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by (362k points)
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Best answer
The correct choice is (a) Momentum only

Explanation: When the bullet is released from the gun, it moves through the individual air molecules. These molecules tend to vibrate which cannot be seen though our naked eye. The solid block acts as a “momentum sink”. It’s so big when compared to a tiny bullet that it can absorb all the momentum without visibly moving.

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