Answer the questions given below on the concept of kinetic energy.
a. (i) Define kinetic energy of a body.
b. (ii) State the mathematical expression for the kinetic energy of a body, clearly mentioning what each symbol represents.
c. (iii) Write the SI unit of kinetic energy.
d. (iv) Name any two independent factors on which the kinetic energy of a body depends and explain in one sentence how each factor affects the kinetic energy.