# Which has more momentum, a #6kg# object moving at #9m/s# or a #4kg# object moving at #3m/s#?

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

For the first object: momentum = 6 kg × 9 m/s = 54 kg*m/s.

For the second object: momentum = 4 kg × 3 m/s = 12 kg*m/s.

Therefore, the 6kg object moving at 9m/s has more momentum, with 54 kg*m/s, compared to the 4kg object moving at 3m/s, which has 12 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 25 gram bullet (0.025 kg) is fired from a gun with a speed of 210 m/s. If the gun has a mass of 0.91 kg. when rounded to 2 significant figures what is the recoil speed of the gun?
- 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 #- 5 m/s#. If #10%# of the kinetic energy is lost, what are the final velocities of the balls?
- A ball with a mass of #7 kg# moving at #3 m/s# hits a still ball with a mass of #9 kg#. If the first ball stops moving, how fast is the second ball moving?
- A ball with a mass of #9 kg # and velocity of #2 m/s# collides with a second ball with a mass of #3 kg# and velocity of #- 5 m/s#. If #10%# of the kinetic energy is lost, what are the final velocities of the balls?
- A ball with a mass of # 6 kg# is rolling at #18 m/s# and elastically collides with a resting ball with a mass of #3 kg#. What are the post-collision velocities of the balls?

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