1. The problem statement, all variables and given/known data If we take the gravitational acceleration at the earths surface as 10,/s^2 and the radius of the earth as 6400km, decrease in the value of the gravitational acceleration g at a depth of 64 km from its surface would be ......,/s^2 2. The attempt at a solution I was never really good in physics or maths so forgive me if this sound too stupid. I tried using acceleration due to gravity at a distence d to the center, Gd= Go [ 1-d/R], where Go is the acceleration due to gravity at the surface of earth. But when I did this the solution became very messed up. Thank you very much for your help.