Define average speed and average velocity. In what case can respect for average velocity to be equal to average speed?
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Average speed is defined as the total distance travelled by the body in total time i.e.
It is a scalar quantity. Its unit is m/s.
average velocity
It is a vector quantity and has units of m/s.
Magnitude of average velocity is always less than or equal to the average speed because displacement is always smaller than or equal to distance.
If the motion of an object is along a straight line and in the same direction, the magnitude of displacement is equal to the total path length. In that case, the magnitude of the average velocity is equal to the average speed.
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