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The diagram below shows the path of a student on a sled starting from rest at point W.
The student slides down a frictionless, snow-covered hill past point Z, which is at ground level.
Which of the following statements best describes the energy of the student and sled from point W to point Z?
A. The total energy at point W is less than at point Z.
B. The total energy at point W is greater than at point Z.
C. The potential energy at point W becomes all kinetic energy at point Z.
D. The kinetic energy at point W becomes all potential energy at point Z.
What is C? The potential energy becomes kinetic energy.