question_answer 25)

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.  

Answer:

Initial mass of rifle Let initial velocity of recoil of rifle  Initial momentum of the rifle Initial mass of bullet Initial velocity of bullet Initial momentum of bullet By the law of conservation of momentum, Momentum of the rifle = Momentum of bullet Negative sign indicates that rifle moves in a direction opposite to the direction of bullet.