# A ball with a mass of #2kg# moving at #8 m/s# hits a still ball with a mass of #6 kg#. If the first ball stops moving, how fast is the second ball moving?

The velocity of the second ball is

The linear momentum is conserved.

Consequently,

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The second ball will move at a velocity of 2 m/s in the same direction as the initial velocity of the first ball.

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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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