Question

application of gravitation law

Answer 1

Universal law of gravitation is applied at every place in this universe. Every single body is applying some force on another body.

Answer 2

Gravitational force means the force exerted by one body to the another.
We r applying some force on earth so the earth is also applying some force on us
As we know that acc. To newton's third law of motion there is an equal and opposite reaction to any action.
So this can be easily shown here.