1. The problem statement, all variables and given/known data A block of mass 10kg starts at the top of a frictionless track which forms a quarter circle with radius 10m. It is given an initial downward velocity of 10m/s. What is the velocity at the bottom of the track? 2. Relevant equations KEtranslational, f+ KErotational, f+PEf=KEtranslational, i+KErotational, i+ PEf KE, rotational=1/2Iw2 KE, translational=1/2mv2 PE=mgh I=MR2 w=v/r 3. The attempt at a solution I believe the initial equation would be set up like this. 1/2mvf2+ 1/2 MR2(V/R)2+mghf=1/2mvi2+1/2 MR2(V/R)2+mghi which would then reduce to: vf2=vi2+ghinitial This does not seem like the likely way to do it because we are not given the height of the mass at the top. Should I be using the rotational and translational KE in the equation? At what point is it rotational and what point translational?