I now show you that if a particle starts from a point with position vector **r**_{0} and moves with constant velocity **v**, then its displacement from its initial position at time t is t**v** and its position vector **r** is given by **r**= **r**_{0}+ t**v**

**r**_{0} and moves with constant velocity **v**, then its displacement from its initial position at time t is t**v** and its position vector **r** is given by **r**= **r**_{0}+ t**v**