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21 October, 21:08

A tennis player smashes a ball of mass m horizontally at a vertical wall. The ball rebounds at the same speed v with which it struck the wall. Has the momentum of the ball changed, and if so, by how much?

A. 4mv

B. 0

C. mv

D. 0.5mv

E. 2mv

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Answers (1)
  1. 21 October, 21:53
    0
    B. 0

    Explanation:

    Change in momentum: This is defined as the product of mass and change in velocity of a body. or it can be defined as the product of force and time of a body. The fundamental unit of change in momentum is kg. m/s

    Change in momentum = M (V-U) ... Equation 1

    where M = mass of the ball, V = final velocity of the ball, U = initial velocity of the ball.

    Let: M = m kg and V = U = v m/s

    Substituting these values into equation 1

    Change in momentum = m (v-v)

    Change in momentum = m (0)

    Change in momentum = 0 kg. m/s

    Therefore the momentum of the ball has not changed.

    The right option is B. 0
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