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11. A box can be moved up an inclined plane with constant velocity by a force of
magnitude F1 or down the inclined plane with constant velocity by a force of
magnitude F2. Find the coefficient of friction u between the box and the inclined
plane. It holds that F1 = 6F2 and both forces are parallel with the inclined plane.
The angle a between the inclined plane and the horizontal plane is 15°.
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