What is the minimum velocity with a body of mass m must enter a vertical loop of radius R so that it can complete the loop ?

What is the minimum velocity with a body of mass m must enter a vertic

1.	What is the minimum velocity with a body of mass m must enter a vertical loop of radius R so that it can complete the loop ?
Answer» `SQRT(2gR)` `sqrt(3gR)` `sqrt(5gR)` `sqrt(GR)` ANSWER :C