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A 200-kg roller coaster reaches the top of the steepest hill with a speed of 5.60...

A 200-kg roller coaster reaches the top of the steepest hill with a speed of 5.60 km/h. It then descends the hill, which is at an angle of 25° and is 58.0 m long. What will its kinetic energy be when it reaches the bottom? Assume µk = 0.10.

A boy pulls a 20.0-kg box with a 130-N force at 33° above a horizontal surface. If the coefficient of kinetic friction between the box and the horizontal surface is 0.29 and the box is pulled a distance of 20.0 m, what is the net work done on the box?

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