# Illustration Example of Conversion of Kinetic Energy into Potential Energy and Vice Versa

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A trolley with a certain energy $$W = W_{\text{kin}}$$ rolls up a hill.
• Before the hill, the trolley has only kinetic energy $$W_{\text{kin}}$$ and no potential energy $$W_{\text{pot}}$$.
• On the hill the trolley has only potential energy $$W_{\text{pot}}$$ and no kinetic energy $$W_{\text{kin}}$$.
• Behind the hill the trolley has only kinetic energy $$W_{\text{kin}}$$ and no potential energy $$W_{\text{pot}}$$.
• When rolling up and down, the trolley has both potential energy $$W_{\text{pot}}$$ and kinetic energy $$W_{\text{kin}}$$.