# Physics

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A sled is being held at rest on a slope that makes an angle (theta) with the horizontal. After the sled is released, it slides a distance (d1) down the slope and then covers the distance (d2) along the horizontal terrain before stopping. Find the coefficient of kinetic friction (kf) in terms of d1 d2 and theta between the sled and the ground, assuming that it is constant throughout the trip.

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