What is the momentum of the blue and the green billiard balls respectively, before the collision, if each has a mass of 0.15 kg and the blue ball has a speed of 3 m/s and the green has a speed of -2 m/s?

Answer 1

The momentum of an object is calculated by multiplying its mass by its velocity.

For the blue ball:
Momentum = mass x velocity
Momentum = 0.15 kg x 3 m/s
Momentum = 0.45 kg m/s

For the green ball:
Momentum = mass x velocity
Momentum = 0.15 kg x (-2 m/s) [note: the negative sign indicates the direction of the velocity]
Momentum = -0.3 kg m/s

Therefore, the momentum of the blue ball is 0.45 kg m/s and the momentum of the green ball is -0.3 kg m/s before the collision.