A small spherical ball is released from a point at a height h on a rough track. Assuming that it does not slip any where , find its linear speed when it rolls on the horizontal part of the track.

Question

$$\begin {array} {1 1} (a)\;\sqrt {\frac{11\;gh}{7}} & \quad (b)\;\sqrt{\frac{3gh}{5}} \\ (c)\;\sqrt {\frac{7gh}{5}} & \quad  (d)\;\sqrt {\frac{10gh}{7}} \end {array}$$