A tunnel is dug along a chord of the earth at a perpendicular distance R/2 from the earth.s centre. The wall of the tunnel may be assumed to be frictionless. A particle is released from one end of the tunnel. The pressing force by the particle on the wall and the acceleration of the particle varies with x (distance of the particle from the centre of earth ) according to

A tunnel is dug along a chord of the earth at a perpendicular distance

1.	A tunnel is dug along a chord of the earth at a perpendicular distance R/2 from the earth.s centre. The wall of the tunnel may be assumed to be frictionless. A particle is released from one end of the tunnel. The pressing force by the particle on the wall and the acceleration of the particle varies with x (distance of the particle from the centre of earth ) according to
Answer» ANSWER :B::C