A particle moves in the x-y plane with potential energy U = x^2 - y^2 (read: U equals x squared minus y squared). At which of the following points is the particle at mechanical equilibrium?
W) (1, 1)
X) (1, -1)
Y) (-1, -1)
Z) (0, 0)
✔️Answer:Z) (0, 0)
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