. From a rifle of mass 4 kg

a bullet of mass 50 g is fired with an initial velocity of 35 m/s. calculate the initial recoil velocity of the rifle.


Best Answer


The initial velocity of the rifle is 0m/sec.

So the initial momentum of the rifle is,

(mass of the rifle+mass of the bullet)0=(4+50 /1000)×0=0

Let the initial velocity of rifle is v1and the bullet is v2.

The final momentum of the system will be,


Now the conservation of momentum theory say that,

Initial momentum = Final momentum



⇒v1=-1.75 / 4


Final Answer:

The rifle recoil backwards with speed 0.4375m/sec.




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