Do the gravitational forces obey Newton's third law of motion?

State two factors on which the value of $g$ depends.

An apple falls from a tree because of gravitational attraction between the earth and the apple. If $F_1$ is the magnitude of force exerted by the earth on the apple and $F_2$ is the magnitude of force exerted by the apple on the earth,then:

According to Newton's law of gravitation,every particle of matter attracts every other particle. But bodies on the surface of the Earth never move towards each other on account of this force of attraction. Why?

$A$ stone is released from the top of a tower of height $19.6 \, m$. Calculate its velocity just before touching the ground.

Prove that if a body is thrown vertically upwards,then the time of ascent is equal to the time of descent.