Which of the following situations is an example of change in momentum? a. a tennis ball hit into a net b. a helium ballon rising up into the sky c. an airplane flying through scattered clouds

Answer: A. Tennis ball hit into a net

Explanation:

Momentum = m. v (where m = mass of object and v = velocity of object)

However, the velocity of the ball is in a direction + x

The mass of the ball is definitely comstant. However, the ball's velocity is subject to change - both in magnitude and direction.

When the ball is hit at one side of the court, it assumes a velocity u.

Its momentum at u = m. u-->

(--> representing the direction)

Immediately it crashes into the net, both the magnitude and direction of its velocity experience a sharp change as it is hurled in a direction opposite its former direction.

Obviously, the correct answer is option A