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A girl pulls a box of mass m = 6 kg across a floor with a constant horizontal force F = 22 N. Initially the block is at rest. For the first d1 = 7 m, there is no friction between the box and the floor. For the next d2 = 7 m the coefficient of friction between the box and the floor is µ = 0.2.

a) What is the work done on the box by the girl in moving the box over the distance d1 + d2?

b) What is work done on the box by friction in moving the box over the distance d1 + d2?

c) What is the final speed of the box (after being pushed to d1 + d2)?

The girl lets go of the box at this point and it slides up a frictionless incline of angle q = 28°.

d) How high up will it go? (measured vertically from the floor)

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