A direction is required before we can describe the force properly. Displacement is a distance and a direction, eg \(170m\) south. Velocity is a speed and a direction, eg \(12 m\,s^{-1}\) ...

The only difference between velocity and speed is that velocity has a direction, and so is a vector quantity. Average velocity = \(\frac{\text{displacement}}{\text{time}}\) Displacement is the ...