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A body of mass m starting from rest sli...

A body of mass m starting from rest slides down a frictionless inclined surface of gradient `tanalpha` fixed on the floor of a lift accelerating upward with acceleration a. Taking width of inclined plane as w, the time taken by body to slide from top to bottom of the plane is `sqrt((Pw)/((g+a)sin2alpha)` Find the value of P.

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