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A "75kg" man stands at the rear end of a...

A "75kg" man stands at the rear end of a platform of mass "25kg" and length "4m" .while system is moving initially at `4m/s `over a frictionless surface.At t=0, he walks at `2m/s` relative to the platform and then stops at the front end.Find the displacement of the platform during the period the man walks on the platform (in "m" )

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