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A box is placed at the top of a ramp and begins to slide. The angles...

A box is placed at the top of a ramp and begins to slide. The angles of the ramp is 30 degrees. The ramp is 40 meters long. If the box reaches a speed of 4 m/s at the bottom of the ramp, what is the coefficient of friction between the box and the ramp? Assume the initial velocity of the box is zero.

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