Question

A ball has a mass of 0.30kg. it moves horizontally with a speed of 3.0m/s in the direction shown. The ball hits the wall.

The ball rebounds from the wall with a horizontal speed of 2.0m/s. What is the change in momentum of the ball?

Answer 1

Subtract the initial momentum from the final momentum to calculate the change in momentum of the ball. Hence, the change in momentum is -0.30 kg·m/s.

Step-by-step explanation:

The change in momentum of an object can be calculated by subtracting the initial momentum from the final momentum. Momentum is the product of mass and velocity.

In this case, the initial momentum of the ball can be calculated by multiplying its mass (0.30 kg) by its initial velocity (3.0 m/s). The final momentum can be calculated by multiplying the mass by the final velocity (2.0 m/s).

To find the change in momentum, subtract the initial momentum from the final momentum.

Therefore, the change in momentum of the ball is:

Change in momentum = Final momentum - Initial momentum

Change in momentum = (0.30 kg)(2.0 m/s) - (0.30 kg)(3.0 m/s)

Change in momentum = -0.30 kg·m/s