Q. 403.9( 7 Votes )

A block A can slide on a frictionless incline of angle θ and length l, kept inside an elevator going up with uniform velocity u (figure 5-E22). Find the time taken by the block to slide down the length of the incline if it is released from the top of the incline.

Answer :


Given:


The force on the block which makes the body move down the plane is the component of its weight parallel to the inclined surface.


F = mg sinθ


Acceleration, g = sin θ


Initial velocity of block, u = 0


Distance to be covered ,s = l


a = g sin θ


Using, , we get:



Time taken, t=


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