If a person is pushing a box inside a moving train, P the work done...

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If a person is pushing a box inside a moving train,
P the work done in the frame of earth will be:

W
\( \vec{S}_{0}= \) displacement of the train relative to ground.
\( \vec{S}= \) displacement of the box w.r.t. train.
(1) Zero
(2) \( \vec{F} \cdot\left(\vec{S}+\vec{S}_{0}\right) \)
(3) \( \vec{F} \cdot \vec{S} \)
(4) \( \vec{F} \cdot \vec{S}_{0} \)
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