A force of 40.0 N is required to start a 5.0-kg. box moving across a horizontal concrete floor. (a) What...

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A force of 40.0 N is required to start a 5.0-kg. box moving across a horizontal concrete floor. (a) What is the  coefficient of static friction between the box and the floor? (b) If the 40.0 N-force continues, the box accelerates at  0.70 m/s^2. What is the coefficient of kinetic friction?

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