. 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

Explanation:

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,

=(4×v1)+(0.05×35)

Now the conservation of momentum theory say that,

Initial momentum = Final momentum

⇒4v1+1.75=0

⇒4v1=-1.75

⇒v1=-1.75 / 4

⇒v1=-0.4375

Final Answer:

The rifle recoil backwards with speed 0.4375m/sec.

 

 

 

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