Vector has a wide range of applications in practical problems. In physics, vectors can be used to describe physical quantities such as force, velocity and acceleration. For example, Newton's second law F=ma can be expressed by a vector, where f is the resultant force acting on an object, m is the mass of the object, and a is the acceleration of the object.

In engineering, vectors are also widely used. For example, in mechanical design, vectors can be used to calculate the stress and deformation of mechanical parts.