A block of mass is placed on a surface with a vertical cross section given by y = x3/6. If the coefficient of friction is 0.5,the maximum height above the ground at which the block can be placed without slipping is

1. A block of mass is placed on a surface with a vertical cross section given by y = x3/6. If the coefficient of friction is 0.5,the maximum height above the ground at which the block can be placed without slipping is

A) 1/6 m
B) 2/3 m
C) 1/3 m
D) 1/2 m