11. A 0.20-kg particle moves along the x axis under the influence of a stationary object. The potential energy is given by U(x) = (8.0J/m)r + (2.0J/m4)x+, where x is in coordinate of the particle. If the particle has a speed of 5.0 m/s when it is at x 1.0 m, its speed when it is at the origin is: A) 0 B) 2.5 m/s C) 5.7 m/s D) 7.9 m/s E) 11 m/s