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We study multiple elastic collisions of a block and a ball against a rigidwall in one dimension. The complete trajectory of the block is solved as ananalytic function of time. Near the turning point of the block the forcecarried by the ball is proportional to 1/x^3, where x is the distance betweenthe wall and the block, in the limit that the block is sufficiently heavierthan the ball. This is a unique pure mechanical system that reveals dipole-likerepulsion.

A unique pure mechanical system revealing dipole repulsion