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KINETIC FRICTION

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A 3.8KG BOX IS SLIDING ACROSS THE HORIZONTAL FLOOR OF AN ELEVATOR. THE COEFFICIENT OF KINETIC FRICTION BETWEEN THE BOX AND THE FLOOR IS 0.470. DETERMINE THE KINETIC FRICTIONAL FORCE THAT ACTS ON THE BOX FOR EACH CASE.

THE ELEVATOR IS STATIONARY
THE ELEVATOR ACCELERATES UPWARDS AT 2.0 M/S2
THE ELEVATOR ACCELERATES DOWNWARD AT 2.0M/S2

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