question_answer

  A rifle of mass 3 kg fires a bullet of mass 0.03 kg. The bullet leaves the barrel of the rifle at a velocity of 100 m/s. If the bullet takes 0.003 s to move through its barrel, calculate the force experienced by the rifle due to its recoil.

Answer:

                  Here,                                     According to the law of conservation of momentum     (1) On substituting given values, we get or Negative sign indicates that the direction in which the rifle would move is opposite to that of the bullet.                                                  (1) The initial and final momentum of the rifle is 0 and ?3 kg m/s and this change in momentum takes place in 0.003 s. Therefore, the rate of change of momentum or the force experience by the rifle due to its recoil would be The person firing the bullet, therefore, would experience a force of 1000 N in the backward direction due to the recoil of the rifle.       (1)