If a person is pushing a box inside a moving train,the work done in the frame of the earth will be: (where $\vec{s}$ is the displacement of the box in the train and $\vec{s}_0$ is the displacement of the train relative to the ground)
- A$\vec{F} \cdot \vec{s}_0$
- B$\vec{F} \cdot \vec{s}$
- C$\vec{F} \cdot (\vec{s} + \vec{s}_0)$
- Dzero
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