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A 300-kg car is moving on a level road at 20 m/s. (a) How large a retarding force (assumed constant) is required to stop it

A 300-kg car is moving on a level road at 20 m/s. (a) How large a retarding force (assumed constant) is required to stop it in 50 m? (b) What is the minimum coefficient of friction between tires and roadway if this is to be possible? Assume the wheels are not locked, in which case we are dealing with static friction - there is no sliding.

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