1. The problem statement, all variables and given/known data Six roller-coaster carts pass over the same semicircular "bump." The mass M of each cart (including passenger) and the normal force n of the track on the cart at the top of each bump are given in the figures. Rank the speeds (from largest to smallest) of the different carts as each passes over the top of the bump. Cart #1: Normal force of 200 N, mass of 400 kg Cart #2: Normal force of 800 N, mass of 800 kg Cart #3: Normal force of 400 N, mass of 200 kg Cart #4: Normal force of 400 N, mass of 100 kg Cart #5: Normal force of 800 N, mass of 100 kg Cart #6: Normal force of 300 N, mass of 300 kg 2. Relevant equations F = ma a = v^2 / R 3. The attempt at a solution If you are supposed to find the acceleration by using F = ma, then these are the accelerations: #1: 0.5 m/s^2 #2: 1 m/s^2 #3: 2 m/s^2 #4: 4 m/s^2 #5: 8 m/s^2 #6: 1 m/s^2 ..I don't know if that's the correct initial step. I'm not sure what to do from here. The radius is not given.