1. The problem statement, all variables and given/known data A small cube (m=0.450 kg) is at a height of 393 cm up a frictionless track which has a loop of radius, R = 58.95 cm at the bottom. The cube starts from rest and slides freely down the ramp and around the loop. Find the speed of the block when it is at the top of the loop. 2. Relevant equations see below 3. The attempt at a solutions I tried using the formula v^2=4/3 g (0.66H-2R) I don't know i'm really confused at these kind of question, this was obvoiusy wrong, but i think i'm close. or maybe not. Thanks for all the help.