question_answer

  A bullet of mass 20 g is fired from a pistol of mass 2 kg with a horizontal velocity of 150 m/s. Calculate the recoil velocity of the pistol.

Answer:

                  Mass of bullet, m = 0.02 kg Mass of pistol, M = 2 kg Velocity of bullet v = 150 m/s                     (1/2) Velocity of pistol,                     (1/2) (-ve sign shows that direction of motion of bullet and pistol are opposite to each other) From law of conservation of momentum, Momentum of pistol = Momentum of bullet MV=-mv Velocity of pistol,                                                     (1/2)  (in opposite direction to bullet).              (1/2)