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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 \( W_{\text{kin}} \).