A billiard ball moves with 3 kg⋅m/s

Question

of momentum and strikes three other billiard balls. What is the total momentum of the balls after the collision?(1 point)
Responses

less than 3 kg⋅m/s
less than 3 kilograms times meters per second

more than 3 kg⋅m/s
more than 3 kilograms times meters per second

3 kg⋅m/s
3 kilograms times meters per second

It depends on the mass of each ball.

Answer 1

The total momentum of a system is conserved in a collision, provided that no external forces act on it. This means that the total momentum before the collision is equal to the total momentum after the collision.

In this case, before the collision, the total momentum is 3 kg⋅m/s (the momentum of the moving billiard ball). After it strikes the three other billiard balls, the total momentum of the system (the moving ball plus the three struck balls) must still equal 3 kg⋅m/s.

Therefore, the correct response is:

3 kg⋅m/s
3 kilograms times meters per second