A2430 pound roller coaster starts from rest and is launched such that it crests a 105 ft high hill with a speed of 59 mph. the roller coaster travels 396 ft in reaching the top of the hill and there is a constant drag force of 85 pounds. determine launch energy

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To practice problem-solving strategy 10.1 for energy conservation problems. a sled is being held at rest on a slope that makes an angle θ 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 μk between the sled and the ground, assuming that it is constant throughout the trip.