Suppose the coefficient of kinetic friction between ma and the plane in the figure(figure 1) is μk = 0.15, and that ma=mb=2.7kg.

a) as mb moves down, determine the magnitude of the acceleration of ma and mb, given θ = 35∘.

b) what smallest value of μk will keep the system from accelerating?

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.