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A 700 kg car is coasting along a level road, slowing down at an acceleration of...

A 700 kg car is coasting along a level road, slowing down at an acceleration of 7.11 m/s^2 until coming to a stop. 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's no sliding.
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