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Question

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


Solution

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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