# What is the momentum of a 3-kg object moving at 5 m/s?

Momentum is is given by:

Where:

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The momentum of a 3-kg object moving at 5 m/s is 15 kg*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.

- A ball with a mass of #10 kg# moving at #18 m/s# hits a still ball with a mass of #30 kg#. If the first ball stops moving, how fast is the second ball moving? How much kinetic energy was lost as heat in the collision?
- Which has more momentum, an object with a mass of #5kg# moving at #3m/s# or an object with a mass of #9kg# moving at #2m/s#?
- An astronaut with a mass of #80 kg# is floating in space. If the astronaut throws an object with a mass of #16 kg# at a speed of #3/8 m/s#, how much will his speed change by?
- A ball with a mass of # 5 kg# is rolling at #12 m/s# and elastically collides with a resting ball with a mass of #4 kg#. What are the post-collision velocities of the balls?
- 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 # 9 kg#. What are the post-collision velocities of the balls?

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