Hello! I am having problems with this exercise if someone can please help me. 1. The problem statement, all variables and given/known data In order to go all the way around a frictionless circular loop of R=2.5 m , how fast must a mass be moving as it exits at the bottom of the loop. 2. The attempt at a solution I am doing this problem in two parts. First I find the velocity at the top, and then I look for the velocity at the bottom. So, part 1. V at top W + PEi + KEi = KEf + PEf + Heat loss 0 + 0 + (1/2)(m)(v^2) = 0 + mgh + 0 v= sqrt [(gh)(2)] = sqrt [(9.8*4*R)] = 9.89 part 2. V at bottom W + PEi + KEi = KEf + PEf + Heat loss 0 + mgh + (1/2)(m)(vtop^2) = (1/2)(m)(vbot^2) + 0 + 0 sqrt[((gh)+(1/2)(vtop^2))*2] = vbot sqrt[((g2*R)+(1/2)(vtop^2))*2] = vbot vbot = 11.06 However, the homework says I should be getting 12 m/s as a response.