Question

A hockey ball of mass. 2kg travelling at 0.10ms-1 is struck by a hockey stick so as to return it along its original path with a velocity at 2m/s. Calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick

Answer 1

Answer:

Mass of ball (m) = 200 g = 0.2 kg

Initial velocity of ball ({u_1}u1 ) = 10 m {s^{-1}}s−1

Initial momentum of ball = {mu_1}mu1 = 0.2 kg x 10 m{s^{-1}}s−1 = 2 N s

Final velocity of ball {(u_2)}(u2) = - 5 m {s^{-1}}s−1(Minus sign denotes that ball is moving in opposite direction.)

Final momentum of ball ={mu_2}mu2 = 0.2 kg x -5 m{s^{-1}}s−1 = -1 N s

Change in momentum = Final momentum - Initial momentum = - 1Ns - 2Ns = - 3N s. (Minus sign denotes change in momentum in the direction opposite to the direction of initial momentum of the ball.

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