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OpenStudy (anonymous):
The mass of a subway car and passengers is 40,000 kg. If its acceleration as it leaves a station is 0.9m/s^2, what is the net force acting on it?
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OpenStudy (anonymous):
F=ma The only force acting on it in this problem is the force of the subway car accelerating in the +x direction 40000*.9=3.6x10^4 N
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