An unconstrained rifle of mass 5.00kg fires a 50.0g bullet at a speed of 300.0m/s with respect to the ground.
a) What is the initial momentum of the rifle-bullet system?
b)What is the recoil velocity of the rifle?
1
Expert's answer
2016-07-05T10:01:01-0400
a) before the shot fired, both the rifle and the bullet are at rest, so their momentums are zero: therefore, the total momentu, of the system is zero b) the total momentum of the system remains zero; M(bullet) x V(bullet) + M(rifle) x V(rifle) = 0; V(rifle) = M(bullet) x V(bullet) / M(rifle); V(rifle) = 0.05 x 300 / 5 = 3 m/s
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