State whether following algebraic operations with scalar and vector physical quantities are meaningful :

A. Only scalar quantities of the same nature can be added, i.e., scalars to be added must represent the same physical quantity. For eg., two masses can be added, but mass cannot be added to length.

B. Adding any two vectors algebraically is not meaningful because of their directions. Two vectors of different nature cannot be added. Even if two vectors are of same nature, they can be added by using triangle or parallelogram law of addition.