A tunnel is dug along the diameter of the earth. There is a particle of mass m at the centre of the tunnel. Find the minimum velocity given to the particle so that is just reaches to the surface of the earth. (R = radius of earth )

A tunnel is dug along the diameter of the earth. There is a particle o

1.	A tunnel is dug along the diameter of the earth. There is a particle of mass m at the centre of the tunnel. Find the minimum velocity given to the particle so that is just reaches to the surface of the earth. (R = radius of earth )
Answer» `sqrt((GM)/(R ))` `sqrt((GM)/(2R))` `sqrt((2GM)/(R ))` it will reach with the HELP of NEGLIGIBLE VELOCITY Answer :A