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The brakes of a car exert a force of 700N to stop it. the car weighs 17345N and

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and moves at 20m/sec. What is the mass of the car? what is the initial momentum of car? what is the change in momentum of car? how long does it take to stop the car?

Oct 22nd, 2017

The mass is m = W/g = 17345 N/ 9.81 m/s^2 = 1768 kg.

The initial momentum is p = m v = 1768 * 20 = 35360 kg*m/s. When the car stops, the change is momentum is -35360 kg*m/s.

The time it takes to stop the car is t = p / F = 35360 / 700 = 50 s.

Mar 18th, 2015

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