1. The problem statement, all variables and given/known data A small mass m slides down from rest at the top of a frictionless spherical surface of radius R=.5 meters. What is the speed of the particle at position x where it loses contact with the surface, and velocity makes an angle of θ=48.2 with the vertical? The answer choices are: (A) 1.28 m/s (B) 1.82 m/s (C) 1.93 m/s (D) 2.36 m/s (E) 2.58 m/s 2. Relevant equations Conservation of Energy? 3. The attempt at a solution I thought maybe start with PE1=PE2+KE, where h=2r, and then find the cosine component of the height when velocity is at that angle, to do: mg(2r)=(1/2)mv2+mg((cos48.2)+R), but that didn't work. I got .57, which is not even close to any of the choices.