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From a rifle of mass 4 kg, a bullet of mass 50 g is fired with an initial velocity of 35 m s–1 . Calculate the initial recoil velocity of the rifle

Sciences - Main Course Book

Chapter 9. Force and Laws of Motion



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M = 4 kg              m  = 50 gms
v  = 35 m/sec

initial momentum of rifle and bullet together = 0.  So  as per the conservation of linear momentum,
       0 = M * (-V) +  m  v 
=>     0   = 4 * (-V) + 50/1000  * 35
V =  0.4375  m/sec    recoil velocity

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