1. The problem statement, all variables and given/known data Consider a frictionless track as shown (I will attach an image in a follow up post). A block of mass M1= 5.00 kg is released from point A. It makes a head-on elastic collision at B with a block of mass m2 = 10 kg that is initially at rest. Calculate the maximum height to which m1 rises after the collision. 2. Relevant equations p1+p2 = p1' + p2' .5mv2+.5mv2=.5mv2'+.5mv2+ 3. The attempt at a solution Okay, so I tried mixing the Kinetic energy with some momentum equations and also potential energy because KE=-U, but I feel like I probably totally screwed up, and when I tried to use kinematics it didn't work out very well. The answer I got was 5 meters, but I do not know what the correct answer is. (I will post an image with my work as well, because personally I find it hard to read typed math and prefer pictures, and someone else might too) Thank you so much to anyone who can help!