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A small block of mass 'm' is placed on b...

A small block of mass 'm' is placed on bigger block of mass `M_(1)` which is placed on a fractionless horizontal surface. The two blocks are given equal speed `u_(1)` but opposite directions, as shown in the figure. After sometime, it is observed that both blocks are moving in the direction of motion of the lower block, with a speed greater than `(u)/(2)`. It can be concluded that -

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