Figure 8-35 depicts the potential energy of a 655-kg pallet that slides from rest down a frictionless roller conveyer ramp, then moves across a frictionless horizontal conveyer, and finally encounters a horizontal spring at x = 4.0m. (a) What is the angle of inclination of the conveyer ramp? (b) What will be the speed of the pallet at x = 6.0m if it begins sliding from rest at x = 0?