A small body is placed at the top of a smooth sphereof radius r. what should be the horizontal velocity given to the body so that it loses contact with the sphere when its height from the centre of the sphere is (4r)/(5)?

A small body is placed at the top of a smooth sphereof radius r. what

1.	A small body is placed at the top of a smooth sphereof radius r. what should be the horizontal velocity given to the body so that it loses contact with the sphere when its height from the centre of the sphere is (4r)/(5)?
Answer» ANSWER :`SQRT((2gr)/5)`