The velocity of any object depends upon

The displacement, the time and the direction

Explanation:

The velocity of an object is defined as:

where

d is the displacement, which is a vector describing the change in position of the object

t is the time in which the displacement takes place

Since d (the displacement) is a vector, velocity is a vector as well: this means that it also has a direction, which corresponds to the direction of the displacement.

The magnitude of the velocity, insteand, is called speed.

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.