# A ball with a mass of #2 kg# is rolling at #7 m/s# and elastically collides with a resting ball with a mass of #4 kg#. What are the post-collision velocities of the balls?

v1 = -2,33 m/s

v2 = 4,66 m/s

If you put the values in the equation of conservation of energy, you find that it is verified

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The post-collision velocities are 2 m/s for the 2 kg ball and 6 m/s for the 4 kg ball.

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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.

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- How much momentum does a #1 kg# object moving at #10 m/s# have?
- A ball with a mass of #2 kg# is rolling at #12 m/s# and elastically collides with a resting ball with a mass of #1 kg#. What are the post-collision velocities of the balls?
- How do you calculate inelastic collisions?

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