A coin is sliding down on a smooth hemi-spherical surface of radius R. The height from the bottom, where it looses contact with the surface is:

A coin is sliding down on a smooth hemi-spherical surface of radius R.

1.	A coin is sliding down on a smooth hemi-spherical surface of radius R. The height from the bottom, where it looses contact with the surface is:
Answer» `R//3` `(2R)//3` `(3R)//4` `(4R)//5` Answer :B