Time taken by the rolling object in inclined plane to reach its bottom

1.	Time taken by the rolling object in inclined plane to reach its bottom is
Answer» `SQRT((1+(k^(2))/(R^(2)))/(g sin^(2) theta))` `sqrt((2gh)/(1+(k^(2))/(R^(2))))` `sqrt((2h(1+(k^(2))/(R^(2))))/(g sin^(2) theta))` `sqrt((2h(1+(R^(2))/(k^(2))))/(g sin^(2) theta))` ANSWER :C

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