Q.

When the bullet is fired from the gun, the gun recoils due to the_


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a

 Conservation of mass       

b

  Conservation of momentum       

c

  Conservation K.E.       

d

  None of the above 

answer is B.

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Detailed Solution

When the bullet is fired from the gun, the gun recoils due to the conservation of momentum.
When a gun fires a bullet, it puts a force on the bullet that pushes it forward. The bullet, the same way, exerts an equal and opposing force on the gun in the reverse direction. Then here, according to the law of conservation of linear momentum,
Linear momentum of the gun before firing = Linear momentum after firing.
 
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