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A body (A) of mass 100 g and another bod...

A body (A) of mass 100 g and another body (B) of mass 400 g approach each other with velocities of 100 cm`cdot s^(-1) and 10cm cdot s^(-1)` respectively. After a head on collision, the bodies coalesce. After collision, find the displacement of the combined mass in 10 s .

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in the direction of motion of A, 120 cm
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