Is it possible to shield a body from gravitational effects?

$A$ ball thrown up vertically returns to the thrower after $6 \, s$. Find:
$(a)$ The velocity with which it was thrown up.
$(b)$ The maximum height attained. (Take $g = 9.8 \, m s^{-2}$)

State whether the following statement is True or False:
The inertia of an object depends upon its mass.

If the diameter of the earth becomes two times its present value and its mass remains unchanged,then how would the weight of an object on the surface of the earth be affected?

$A$ stone is allowed to fall from the top of a tower $100 \, m$ high and at the same time another stone is projected vertically upwards from the ground with a velocity of $25 \, m s^{-1}$. Calculate when and where the two stones will meet? (Take $g = 10 \, m s^{-2}$).

The factors associated with the motion of an object are: Force,Velocity,Acceleration,and Momentum. Out of these four factors,which one remains constant for all bodies—large or small—undergoing a free fall?