If a tunnel is cut at any orientation through earth, then a ball released from one end will reach the other end in time (neglect earth rotation)

If a tunnel is cut at any orientation through earth, then a ball relea

1.	If a tunnel is cut at any orientation through earth, then a ball released from one end will reach the other end in time (neglect earth rotation)
Answer» `84.6` MINUTES `42.3` minutes 8 minutes depends on ORIENTATION. Solution :`g_(d)=G(1-(d)/(R ))rArr g_(d)=(g)/(R )(R-d) rArr g_(d)=(g)/(R )X` `F_(R )=-mg_(d) rArr F_(R )=-(mg)/(R )x` `T=2pi sqrt((MR)/(mg)) rArr T=2pi sqrt((R )/(g)) Ϸ T = 84.6` min `t = (T)/(2) rArr t = 42.3` min