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When brakes are applied in a car,the bra...

When brakes are applied in a car,the brake-shoes apply frictional force on the wheels.these forces are internal for the system(car).For retardation,external forces ust act on the system.The force of friction at the road surface remains the same before and after teh brakes are applied `(f = mu N)`.How does the car stop?

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JBD PUBLICATION-LAWS OF MOTION-EXAMPLE
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  11. It is difficult to start motion than to maintain it .Explain.

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