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a force of 35N is required to start a 6kg box moving across a horizontal concrete...

a force of 35N is required to start a 6kg box moving across a horizontal concrete floor. (a) what is the coefficient of the static friction between the box and floor? (b) if the 35N force continues the box accelerates to 0.60m/s2. what is the cowfficient of the kenetic friction

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