# What does the law of conservation of momentum mean?

It means that in a collision (even an inelastic collision) total momentum after the collision is the same as total momentum before the collision.

I hope this helps, Steve

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The law of conservation of momentum states that in a closed system, the total momentum before a collision is equal to the total momentum after the collision, provided no external forces act on the system. In other words, momentum is conserved in collisions, meaning it remains constant if there are no external forces acting on the system.

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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 dish of mass 10g is kept horizontally in air by firing bullets of mass 5g each at the rate of 100/s. I the bullets rebound with the same speed,what is the velocity with which bullets are being fired?
- A ball with a mass of # 6 kg# is rolling at #25 m/s# and elastically collides with a resting ball with a mass of # 2 kg#. What are the post-collision velocities of the balls?
- How much momentum does a #2 kg# object moving at #15 m/s# have?
- A ball with a mass of #11# #kg# moving at #18# #ms^-1# hits a still ball with a mass of #22# #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 #5 kg # and velocity of #8 m/s# collides with a second ball with a mass of #2 kg# and velocity of #- 6 m/s#. If #10%# of the kinetic energy is lost, what are the final velocities of the balls?

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