A cyclist rides her bike up a very steep hill. Which of the following statements properly describes this activity in energetic terms?
a) Potential energy in food is converted to kinetic energy as the cyclist's muscles push her up the hill
b) Kinetic energy is highest when the cyclists is at the crest of hill
c) The cyclist produces the most potential energy as she cruises down the hill's steep slope
d) Potential energy is greatest when the cyclist is at the top of the hill
e) both a) and d)
Ans: e) both a) and d)
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