What will happen if the force of gravity disappears suddenly?

Two objects of masses $m_1$ and $m_2$ having the same size are dropped simultaneously from heights $h_1$ and $h_2$ respectively. Find out the ratio of time they would take in reaching the ground. Will this ratio remain the same if $(i)$ one of the objects is hollow and the other one is solid and $(ii)$ both of them are hollow,size remaining the same in each case. Give reason.

What is weightlessness?

The force of gravitation between two bodies varies with the distance $r$ as:

Consider Earth to be a homogeneous sphere. Scientist $A$ goes deep down in a mine and scientist $B$ goes high up in a balloon. The acceleration due to gravity as measured by:

Two particles are placed at some distance. If the mass of each of the two particles is doubled,keeping the distance between them unchanged,the value of gravitational force between them will be