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

1.	A coin is slidingdown 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