1. The problem statement, all variables and given/known data The instantaneous speed is always equal to the magnitude of the instantaneous velocity at that instant. Why? 2. Relevant equations 3. The attempt at a solution Speed by definition is distance/time and velocity is displacement/time. I tried to reason it out. For a finite interval of time speed is greater than or equal to velocity. But When we talk about instantaneous speed or velocity, the time interval is really short.At that short an interval, the distance and displacement has got to be the same? Is this right?