1. The problem statement, all variables and given/known data A mass moves in a circular path that has a radius of 24.6cm on a horizontal frictionaless surface. If the centripetal force acting on the mass is 96.5N, what is the kinetic energy of the mass? r=0.246m Fc=96.5N 2. Relevant equations He told us to use these and "play around with them": Fc=mv2/r Ek=0.5mv2 3. The attempt at a solution I have not a clue as to how to even begin this one. Maybe use the idea that acceleration centripetal=force centripetal(minus mass)? So use: ac=v2/r 96.5N=v2/0.246m v2=392m/s v=19.8m/s Fc=mv2/r 96.5N(0.246m)=m(19.8m/s)2 m=0.0605kg Ek=0.5mv2 Ek=0.5(0,0605kg)(392m^2/s^2) Ek=11.9J Or am I completely and irrevocably lost?