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?
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.
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