A sphere of mass 2kg and radius 0.5 m is rolling with an initial speed of 1 ms–1 goes up an inclined plane which makes an angle of 30° with the horizontal plane, without slipping. How low will the sphere take to return to the starting point A ?
(1) 0.60 s
(2) 0.52 s
(3) 0.57 s
(4) 0.80 s
