# Which has more momentum, an object with a mass of #3kg# moving at #4m/s# or an object with a mass of #2kg# moving at #6m/s#?

Both have the same momentum.

Momentum = mass x velocity

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The object with a mass of 2kg moving at 6m/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 #4 kg # and velocity of #1 m/s# collides with a second ball with a mass of #9 kg# and velocity of #- 4 m/s#. If #40%# of the kinetic energy is lost, what are the final velocities of the balls?
- A ball with a mass of #4 kg# moving at #3 m/s# hits a still ball with a mass of #26 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?
- The kinetic energy of an object with a mass of #3 kg# constantly changes from #50 J# to #270 J# over #5 s#. What is the impulse on the object at #3 s#?
- A ball with a mass of #5 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 subcompact car, mass 1,000 kg, runs into and sticks to an at-rest, 2,200 kg SUV. lf their final speed is 4.7 m/s, what was the smaller car's initial speed?

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