# Which has more momentum, a #4kg# object moving at #4m/s# or a #5kg# object moving at #9m/s#?

Second object.

The equation gives momentum.

We obtained:

Change to the specified values,

Next,

Same thing, replace with the specified values,

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To calculate momentum, use the formula: momentum = mass × velocity.

For the first object: momentum = 4 kg × 4 m/s = 16 kg*m/s.
For the second object: momentum = 5 kg × 9 m/s = 45 kg*m/s.

The 5kg object moving at 9m/s has more momentum.

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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 #2 kg# is rolling at #9 m/s# and elastically collides with a resting ball with a mass of #1 kg#. What are the post-collision velocities of the balls?
- A ball with a mass of #4 kg # and velocity of #1 m/s# collides with a second ball with a mass of #6 kg# and velocity of #- 8 m/s#. If #10%# of the kinetic energy is lost, what are the final velocities of the balls?
- A ball with a mass of #12# #kg# moving at #8# #ms^-1# hits a still ball with a mass of #20# #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?
- A ball with a mass of #1 kg# moving at #8 m/s# hits a still ball with a mass of #7 kg#. If the first ball stops moving, how fast is the second ball moving?
- A ball with a mass of #13 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?

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