# A ball with a mass of #1 kg# moving at #1 m/s# hits a still ball with a mass of #8 kg#. If the first ball stops moving, how fast is the second ball moving?

The velocity of the second ball after the collision is

We have conservation of momentum

Therefore,

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The second ball will move at a speed of 0.125 m/s in the opposite direction.

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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.

- A ball with a mass of #3 kg# moving at #7 m/s# hits a still ball with a mass of #10 kg#. If the first ball stops moving, how fast is the second ball moving?
- A ball with a mass of #4 kg# moving at #3 m/s# hits a still ball with a mass of #5 kg#. If the first ball stops moving, how fast is the second ball moving?
- Why is law of conservation of momentum important?
- Which has more momentum, a #5kg# object moving at #6m/s# or a #12kg# object moving at #2m/s#?
- Which has more momentum, a #8kg# object moving at #9m/s# or a #4kg# object moving at #7m/s#?

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