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Q.

Due to which of the following laws, a gun recoils after firing a bullet?

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a

Conservation of Energy

b

The backward thrust of gases

c

Newton's Third Law of Motion

d

Newton's First Law of Motion

answer is A.

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Detailed Solution

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  • When a bullet is fired from a gun, a force is exerted on the bullet and as we know, that the mass of the bullet is much lesser than the mass of the gun, therefore, the velocity of the bullet is greater than the velocity of the gun.
  • Now, according to the Newton's Third Law of Motion, every action has its equal and opposite reaction. Therefore, the gun recoils with the velocity which is much lower than the velocity of the bullet as it moves forward.
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Due to which of the following laws, a gun recoils after firing a bullet?