physics

the change in velocity of a car that starts at rest and has a final velocity of 20m/s north

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1. what does it mean

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2. Mass times change in velocity is the momentum change magnitude. The direction of the momentum change is north.

You cannot compute the answer without knowing the mass of the car.

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3. Well, the change in velocity is 20 - 0 = +20 m/s North

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