Answer the following questions related to inertia and force.
a. (i) Define inertia.
b. (ii) State the relation between net force, mass and acceleration for a body moving in a straight line.
c. (iii) What is the SI unit of force?
d. (iv) Out of the following objects, which has the greatest inertia: a cricket ball of mass 0.16kg, a shot put of mass 7.0kg, or a table-tennis ball of mass 0.0027kg? Give only the name of the object.