Question

A tunnel is dug along a diameter of the earth. A ball is released from the surface into tunnel

Answer 1

46) A tunnel is dug across thediameter of earth. A ball is released from the surface of Earth into thetunnel. The velocity of ball when it is at a distance from the centre of earth is (where R = radius of Earth and M = mass of earth) ( 1 ) 3 G M 4 R ( 2 ) 2 G M 3 R ( 3 ) G M 2 R ( 4 ) 2 G M R