An 18.0-Newton wooden block slides across a horizontal wooden floor at constant velocity. Calculate the magnitude of the force of kinetic friction between the block and the floor.
[Show all work, including the equation and substitution with units.]

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Explanation:

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acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

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