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

What is the minimum velcoity with which 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 vertical loop of radius R so that it can complete the loop ?

A small body is tied to an end of an inextensible string of negligible mass and length r, the other end being clamped to a rigid support. What is the minimum velocity with which the body must be projected horizontally so that it can go completely round a vertical circle without slakening of the string at the highest point ?

The adjoining figure represent a semi-circular loop of charge Q and of radius R .The minimum velocity with which a point mass m of charge -q should be projected so that it becoems free from the influence of the loop is

In a loop ,a body starts at a height h =2R. The minimum speed with which the body must be pushed down initially in order that it may be able to complete the vertical circle is

What is the minimum speed required at the bottom to perform a vertical loop, if the radius of the death-well in a circus is 25m?