# A ball with a mass of #2 kg# is rolling at #9 m/s# and elastically collides with a resting ball with a mass of #4 kg#. What are the post-collision velocities of the balls?

In an elastic collision no energy is lost. We can therefore know that the combined momentum of the two objects will be the same after the collision, although the collision will transfer half its momentum from the moving ball to the resting ball.

By signing up, you agree to our Terms of Service and Privacy Policy

The final velocity of the 2 kg ball is 6 m/s, and the final velocity of the 4 kg ball is 12 m/s in the opposite direction.

By signing up, you agree to our Terms of Service and Privacy Policy

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

- The velocity of an object with a mass of #5 kg# is given by #v(t)= 2 t^2 + 9 t #. What is the impulse applied to the object at #t= 7 #?
- A ball with a mass of # 5 kg# is rolling at #8 m/s# and elastically collides with a resting ball with a mass of #4 kg#. What are the post-collision velocities of the balls?
- A ball with a mass of #3 kg# moving at #8 m/s# hits a still ball with a mass of #4 kg#. If the first ball stops moving, how fast is the second ball moving?
- In a collision, is the net impulse experienced by an object equal to its momentum change?
- A ball with a mass of # 2 kg# is rolling at #25 m/s# and elastically collides with a resting ball with a mass of # 2 kg#. What are the post-collision velocities of the balls?

- 98% accuracy study help
- Covers math, physics, chemistry, biology, and more
- Step-by-step, in-depth guides
- Readily available 24/7