question_answer

    An iron sphere of mass 1 kg is dropped from a height of 10 m. If the acceleration of sphere is 9.8 , calculate the momentum transferred to the ground by the ball.

Answer:

                  Here, initial velocity of sphere, u = 0 Distance travelled, s = 10 m Acceleration of sphere, a = 9.8 Final velocity of sphere when it just reaches the ground can be calculated using or or                             (1) Momentum of the sphere just before it touches the ground = mv                                           (1) On reaching the ground, the iron sphere comes to rest, so its final momentum is equal to zero according to the law of conservation of momentum. Momentum transferred to the ground = Momentum of the sphere just before it comes to rest = 14 kg -                                     (1)