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A particle A of mass m moving on a smooth horizontal surface collides with a stationary particle B of mass 2m directly, situated at a distance d from a wall. The coefficient of restitution between A and B and between B and the wall is e = 1/4. Calculate the distance from the wall where they collide again. Assume that the entire motion takes place along a straight line perpendicular to the wall.

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The correct Answer is:
`[12d//13]`
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