We are talking about the potential energy in the gravity field of the Earth.
As long as the orange is stationary, the kinetic energy is 0.
Potential energy:
U=mgh=2⋅10−3 kg ⋅9.8ms2⋅3 m=0.0588 J=5.88⋅10−2 J=58.8 mJ.U = mgh = 2\cdot10^{-3}\text{ kg }\cdot 9.8\frac{\text{m}}{\text{s}^2}\cdot3\text{ m} = 0.0588\text{ J} = 5.88\cdot10^{-2}\text{ J} = 58.8\text{ mJ}.U=mgh=2⋅10−3 kg ⋅9.8s2m⋅3 m=0.0588 J=5.88⋅10−2 J=58.8 mJ.
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