The car (or block) is slowly moving up the incline, and the hanging mass is slowing moving down (i.e. acceleration=zero). There is friction between the block and the surface (plank). Given: The mass hanging (including mass hanger) = 150 g; the mass of car = 200 g; angle of incline=30. For the problem mentioned in Q1, calculate the coefcient of friction between the block and the plank. For the problem mentioned in Q1, calculate the work done by friction when the car moves 40 cm on the plank. (magnitude only) For the problem mentioned in Q1, calculate the work done by gravity on the hanging mass when it falls by 40 cm. (magnitude only)