1. Concepts of Vectors and scalars ,magnitude and direction of a vector

There are two types of physical quantities vector quantity and scalar quantity

Scalar quantity

The quantities which are the only magnitude are called scalar quantities for example time

Vector quantity

The physical quantities which have both direction and magnitude are called vector quantities for example velocity

How can we find the magnitude of a vector

Let A = 2i+3j+4k 

Magnitude of vector = ✓2²+3²+4²

                                    = ✓ 4+9+16 = ✓ 29