Question

A bullet of mass 10 gram is fire duet initial velocity of 20 metre per second from our rifle of mass 4kg. Calculate the initial recoil off the rifle?

Answer 1

Mass of gun M =4 kg Mass of bullet m= 50g                             =50*10^-3 Initial velocity of bullet, v= 35 m/s Let recoil velocity of the gun be m/s Before firing the bullet both gun and bullet were in rest so total momentum of gun and bullet is zero. After firing Momentum of bullet=mv Momentum of gun=Mv Total momentum of bullet and gun after firing = mv+Mv Since, there is no external force applied on the system.  So, total momentum after firing= total momentum before firing mv+Mv=0 Mv = - mv V = - mv/M      =50*10^-3*35/4      =-0.44 m/s

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