What is the name given to the path followed by a projectile?

$(a)$ $A$ cube of side $5\, cm$ is immersed in water and then in a saturated salt solution. In which case will it experience a greater buoyant force? If each side of the cube is reduced to $4\, cm$ and then immersed in water,what will be the effect on the buoyant force experienced by the cube as compared to the first case for water? Give reasons for each case.
$(b)$ $A$ ball weighing $4\, kg$ with a density of $4000\, kg\, m^{-3}$ is completely immersed in water of density $10^3\, kg\, m^{-3}$. Find the force of buoyancy on it. (Given $g = 10\, m\, s^{-2}$)

When a spaceship is two earth radii distant from the centre of the earth,its gravitational acceleration is: (in $, m s^{-2}$)

Write True or False for the following statement:
If a spring balance holding a heavy object is released,it will read zero weight.

Write True or False for the following statement:
The value of $G$ is high if the radius of the body is more and less if radius is less.

What is the ratio of the gravitational force between two masses kept at a certain distance in air to the force between them when kept in any other medium?