Question said: A 10kg block starts from rest at a height of 20m and slides down a frictionless, semicircular track. The block collides with a stationary object of 50kg at the bottom of the track. If the objects stick together upon collision, what is the maximum height that the block-object system could reach? I got the above solution. However, follow up question said: In the above question, determine the height reached by each object if the collisin were inelastic and the falling mass rebounded back with a speed of 1m/s? I was able to figure out that the height for the rebounded mass (10kg) is 0.051m using v^2 = 2as. s=1/(2x9.8). However, I couldn't the right answer for the height of remaining 50kg object? Any help will be greatly appreciated.