The function of the phloem tissue is to transport food nutrients such as glucose and amino acids from the leaves and to all other cells of the plant, this is called translocation.
Velocity is a vector measurement of the rate and direction of motion or, in other terms, the rate and direction of the change in the position of an object. The scalar (absolute value) magnitude of the velocity vector is the speed of the motion.
Although speed and velocity are often words used interchangeably, in physics, they are distinct concepts. Speed is calculated by dividing the distance traveled by time. It does not have direction. Average velocity is the displacement (change in position) divided by time. Created by Sal Khan.