# A ball with a mass of # 3 kg# is rolling at #12 m/s# and elastically collides with a resting ball with a mass of #9 kg#. What are the post-collision velocities of the balls?

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The post-collision velocities of the 3 kg and 9 kg balls are 6 m/s and 18 m/s, respectively.

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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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- An astronaut with a mass of #70 kg# is floating in space. If the astronaut throws an object with a mass of #26 kg# at a speed of #1/6 m/s#, how much will his speed change by?
- How do you calculate the coefficient of restitution?
- When a moving object collides with a stationary object of identical mass, the stationary object encounters the greater collision force. Is that true or false? Why?
- Which has more momentum, an object with a mass of #3kg# moving at #4m/s# or an object with a mass of #2kg# moving at #6m/s#?

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