Revise smart, understand Better

If two objects collide and after the collision they move with the same velocity, which of the following is true?

The collision is perfectly elastic.

The total momentum before the collision is equal to the total momentum after the collision.

Momentum is not conserved.

The total kinetic energy is conserved.

Which of the following is the correct unit of linear momentum?

m/s².

N·s.

kg.

kg·m/s.

A car of mass 1000 kg is moving at a velocity of 20 m/s. What is the car’s momentum?

5000 kg·m/s.

2000 kg·m/s.

200 kg·m/s.

1000 kg·m/s.

Which of the following statements is true about the principle of conservation of linear momentum?

Momentum is conserved in both elastic and inelastic collisions.

Momentum is conserved when external forces are acting on the system.

Momentum is conserved only when objects do not collide.

Momentum is conserved only in elastic collisions.

If two objects collide and their combined mass is unchanged, what happens to their total momentum?

It increases.

It becomes zero.

It decreases.

It remains constant.