1. The problem statement, all variables and given/known data Figure shows a plot of potential energy U versus position x of a 0.900 kg particle that can travel only along an x axis. (Nonconservative forces are not involved.) Three values are UA = 15 J, UB = 35 J and UC = 45 J. The particle is released at x = 4.5 m with an initial speed of 6.80 m/s, headed in the negative x direction. If the particle can reach x = 1.0 m, what is its speed there, and if it cannot, what is its turning point? http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c08/q39.jpg [Broken] 2. Relevant equations Ek=1/2mv^2 3. The attempt at a solution I have no clue what to do.