A block is released from rest and slides down a frictionless ramp inclined at 309 from the horizontal. When the block reaches the bottom; the block-Earth system has mechanical energy Eo: The experiment is repeated, but now horizontal and vertical forces of magnitude F are exerted on the block while it slides, as shown above. When the block reaches the bottom, the mechanical energy of the block-Earth system (A) is greater than Eo (B) is equal to Eo C (C) is less than Eo D) cannot be determined without ~0 knowing F