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[" 28.A smooth inclined plane of length ...

[" 28.A smooth inclined plane of length "L" ,having an "],[" inclination "theta" with horizontal is inside a lift which is "],[" moving down with retardation a.The time taken by a "],[" block to slide down the inclined plane from rest will be "],[[" (a) "sqrt((2L)/(sqrt(a sin theta)))," (b) "sqrt((2L)/(g sin theta))],[" (c) "sqrt((2L)/((g-a)sin theta))," (d) "sqrt((2L)/((g+a)sin theta))]]

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