I had a squash ball going down a ramp, which collided with another squash ball of a slightly different mass at the bottom of the ramp. They then both went off the end of the ramp into a sand pit. However they both fell in the sand pit at different lengths, and so it appears that it is not a perfectly inelastic collision as they do not stay together. I have the speed that it took the first ball to descend the ramp, as well as the distance the first ball would travel off the end of the ramp if there was no second ball. Also, the combined distances of the two balls together is greater than the distance of just one ball. Im confused. Any help? It seems like partial inelastic collision? The ramp is set on a table and is level at the end, and the sand pit is on the floor.