Two blocks are released from rest on either side of a frictionless half-pipe. Block B is more massive than block A. The height HB from which block B is released is less than HA, the height from which block A is released. The blocks collide elastically on the flat section. After the collision, which is correct? A. Block A rises to a height greater than HA and block B rises to a height less than HB. B. Block A rises to a height less than HA and block B rises to a height greater than HB. C. Block A rises to height HA and block B rises to height HB. D. Block A rises to height HB and block B rises to height HA. E. The heights to which the blocks rise depends on where along the flat section they collide. Can someone please explain how to figure this out?