Starting from the centre of the earth having radius r, the variation of g : NEET 2016 Physics

Starting from the centre of the earth having radius r, the variation of g (acceleration due to gravity) is shown by the graph:
The acceleration of gravity is constant at a particular place but it varies from place to place. In this video, we shall study this variation in acceleration due to gravity starting from the centre of earth.
Value of 'g' does not depend on mass of the body (m) which is under freefall on earth
Since 'g' depends only on Gravitational Constant 'G' and on physical dimensions of earth, when two different masses fall freely on earth from same initial point (neglecting air resistance) both of them will reach the earth in same time given by equation s = ut + 0.5*g*t^2, irrespective of their composition, shape and size.
Value of acceleration due to gravity (g) at the centre of earth is zero and on the surface of earth has a value 9.8m/s^2. Between the centre and surface the value of 'g' increases linearly.