Please answer it also !!!

Dear student, 

F = m a

a = F / m  ...(1)

Now, the magnitude of gravitational force is same for the earth and stone, according to newton's law of gravitation and also Newton's third law (action = reaction).

Now, if the same force acts on two different masses, the acceleration would be different according to the formula ...(1)

As the mass of earth is very high, the acceleration would be negligible. Thus, only stone falls towards earth.

Regards