A block of mass m is on an inclined ramp. The ramp makes an angle θ with respect to the horizontal, as shown. The ramp has friction, with coefficient of kinetic friction μk and static friction μs. This experiment takes place on earth. The block has an initial speed of v up the ramp. It travels a distance d along the ramp before it stops. Answer using variables, please d) Calculate the work done by the Friction force as the block travels the distance d. Is it positive, negative, or zero? e) If the block comes to rest, how far has it travelled? Use the work-energy principle and your results of parts b), c), and d). f) Briefly (one sentence) explain why this problem could not be solved using conservation of energy.

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