The relative velocity of the ball with respect to the truck is same as that of the truck with respect to the ball at equal time.
What is relative velocity?
The relative velocity of an object is the velocity of the object observed with respect to rest frame of another object.
Distance traveled by the object
The distance traveled by each object is determined from the prouduct of velocity and time of motion.
d = vt
where;
Thus, if the ball moved the same distance when it was on the flat bed truck, then the relative velocity of the ball with respect to the truck is same as that of the truck with respect to the ball at equal time.
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