Atennis 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

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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a and b sometimes have a positive value