$A$ car is accelerated on a levelled road and attains a velocity $4$ times of its initial velocity. In this process,the potential energy of the car

How does the weight of an object vary with respect to the mass and radius of the Earth? In a hypothetical case,if the diameter of the Earth becomes half of its present value and its mass becomes four times its present value,then how would the weight of any object on the surface of the Earth be affected?

State whether the following statement is True or False:
The centre of mass and centre of gravity for a small body lie at the same point.

An object has a mass of $30 \ kg$. What is its weight $(i)$ on the moon $(ii)$ on another planet? The value of $g$ on the moon is $1/6$ the value of $g$ on the earth. The value of $g$ on the planet is $3$ times the value of $g$ on the earth. Take $g_{earth} = 10 \ m/s^2$.

Define mass and weight of an object. Write their $SI$ units. An object has a mass of $20 \, kg$ on Earth. What will be its mass and weight on the surface of the Moon? ($g$ on Moon $= 1.6 \, m s^{-2}$)

The mass of a man on the earth is $100\, kg$. Does his weight on the moon increase or decrease?