A sled plus passenger (total mass m = 54.6 kg) is pushed a distance d = 19.8 m across a horizontal, snow-packed surface for which the coefficient of kinetic friction with the sled is μk = 0.15. The pushing force is constant and makes an angle of φ = 32.7 degrees below horizontal. The sled moves with constant velocity. a. Write an expression for the work done by the pushing force in terms of m, g (acceleration due to gravity), φ, μk, and d.

b. What is the work done by the pushing force, in joules?

c. Write an expression for the work done on the sled by friction in terms of m, g (acceleration due to gravity), φ, μk, and d.

d. What is the work done on the sled by friction, in joules?

e. What is the net work, in joules, done on the sled?