An insect is at the bottom of a hemispherical ditch of radius 1 m. It crawls up the ditch but starts slipping after it is at height h from the bottom. If the coefficient of friction between the ground and the insect is 0.75, then h is: (g=10 ms−2)
(1) 0.80 m
(2) 0.60 m
(3) 0.45 m
(4) 0.20 m