In each case, a 1-kg object is released from rest on a ramp at a height of 2 m from the bottom. All of the spheres roll without slipping, and the blocks slide without friction. The ramps are identical in Cases A and C. The ramps in Cases B and D are identical and are not as steep as the others. Rank the speed of the objects when they reach the horizontal surface at the bottom of the ramp. Fastest:, Next Fastest:, 3rd Fastest:, Slowest: Explain your reasoning.