FIGURE 8-35 depicts the potential energy of a 350-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 = 4.0 m. When the pallet encounters the spring, it momentarily comes to rest at x = 6.0 m.

(a) What is the force constant of the spring?

(b) At what height h above the horizontal conveyer did the pallet begin sliding from rest?

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