What happens to an accelerated liquid

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When a box containing liquid is accelerated, the liquid experiences inertia, causing it to shift relative to the box. A marble placed in the center of the box rolls backward due to this inertia. This movement can lead to the conclusion that the liquid also appears to roll back. The discussion revolves around understanding the effects of acceleration on both the marble and the liquid. Clarifying these concepts is essential for solving the attached problem effectively.
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Hello,
I have no idea how to do the attached problem. Could you please help me out?
Thanks!
 

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hey sparkle , think what happens when a small marble is but in the bcentre of a box and then the box is accelerated ?
 
hi kushan! the marble seems to roll back (relative to the box) due to inertia? but then wouldn't (d) be the right answer, if the water is "rolling back"?
thanks! :)
 
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