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A smooth inclined plane of length L havi...

A smooth inclined plane of length L having inclination theta with the horizontal is inside a lift which is moving down with a retardation `a`. The time taken by a body to slide down the inclined plane from rest will be
(1) `sqrt((2L)/((g+a)sin theta))`
(2) `sqrt((2L)/((g-a)sin theta))`
(3) `sqrt((2L)/(a sin theta))`
(4) `sqrt((2L)/(g sin theta))`

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