# A ball with a mass of # 2 kg# is rolling at #6 m/s# and elastically collides with a resting ball with a mass of #9 kg#. What are the post-collision velocities of the balls?

The velocity of the first ball is

The velocity of the second ball is

As the collision is elastic, we have conservation of linear momentum and conservation of kinetic energy.

so,

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The post-collision velocity of the 2 kg ball is 4 m/s, and the post-collision velocity of the 9 kg ball is 8 m/s.

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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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