Question

Obtain an expresion for acceleration due to gravity and justify that all object hollow orsolid ,big or small fall from a height at same rate in vacuum.

Answer 1

We found a similar question to the one that you posted. Please check it out here.

As g =GM /r^2

it is not depending on the mass of body.
M implies mass of the earth.

So g will be same for all body at same height irrespective of their sshape , size , weight etc