# A ball with a mass of #9 kg# moving at #7 m/s# hits a still ball with a mass of #15 kg#. If the first ball stops moving, how fast is the second ball moving?

I'm Considering the Collision is Elastic.

According to the Law of Conservation of Momentum,

a system should be constant after a collision]

So, Substituting the values,

The velocity is positive, so the second ball will head towards the direction the first ball was initially going.

Hence explained.

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The second ball will move at 4 m/s after the collision.

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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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