# A large 700 kg truck is driving with a speed of 20 m/s when it collides with a 300 kg car which is not moving. The two stick together. After the collision will the car and truck will have a speed Less than, Greater than. or Equal to 20 m/s?

The final speed after collision must be less than 20 m/s if momentum is to be conserved. In fact, it will be 14 m/s as explained below.

Only the 700 kg truck had momentum prior to the collision (the car was not moving).

The two connected vehicles have a combined mass of 1000 kg after the collision, but there is still a need for a total momentum of 14,000 kgm/s.

Thus, the ultimate velocity needs to be

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The car and truck, after the collision, will have a speed less than 20 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.

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