I'm not quite sure how to even start this question >-< But here it is: A ball with a mass of 0.75 kg initially at rest is placed at the top of curved ramp and allowed to roll down the ramp. It collides with a second ball with a mass of 0.51 kg at the bottom of the ramp which is also initially at rest. The two balls fly off the end of the ramp and land on the floor as indicated on the diagram below. Determine the range of the 0.75kg ball after it leaves the ramp if the range of the 0.51 kg ball is 4.12m. Also determine if this is and elastic or inelastic collision. I understand that momentum is conserved and that i have to find the time for the vertical displacement at the end, but i don't know what to do with the rest of the info i get.