$(a)$ Differentiate between distance and displacement.
$(b)$ Under what conditions is the magnitude of average velocity of an object equal to its average speed?

(N/A) Distance is the total path length covered by an object,whereas displacement is the shortest distance between the initial and final positions of an object.
Distance is a scalar quantity,while displacement is a vector quantity.
Distance can never be negative or zero for a moving object,whereas displacement can be positive,negative,or zero.
$(b)$ The magnitude of average velocity is equal to the average speed when an object moves along a straight-line path in a single direction without changing its direction of motion.