The Earth is acted upon by the gravitation of the Sun,even though it does not fall into the Sun. Why?

Mona weighs $750 \, N$ on Earth:
$(i)$ On the planet Mars,the force of gravity is $38 \%$ of that of Earth. How much will Mona weigh on Mars?
$(ii)$ What will be Mona's mass on Earth (take $g = 10 \, m s^{-2}$)?

Define free fall.

Two stones $A$ and $B$ are dropped from a multi-storey building. Stone $A$ is dropped from $100 \, m$ and at the same time stone $B$ is dropped from $50 \, m$ height. Both of them reach the earth at the same time. Will they have equal velocity while reaching the ground? Calculate and find out the answer (Take $g = 10 \, m s^{-2}$).

Explain by giving reasons:
$(i)$ If a stone held in our hands is released,it falls towards the earth.
$(ii)$ Two objects kept in a room do not move towards each other as per the universal law of gravitation.

What is the effect on the weight of a body due to the revolution of the earth?