The positive direction of the axis is in the direction of increasing numbers. The opposite direction is the negative direction. Displacement is an example of a vector quantity , which is a quantity that has both magnitude and direction. Average Velocity, or the ratio of position displacement to time, is one such quantity. However, average speed involves the total distance covered by an object, not just its displacement.
Instantaneous velocity refers to the velocity of an object at a specific point in time.
The instantaneous velocity is the derivative of the object's position. Again, whereas velocity is vector and has direction, speed is scalar and does not. Acceleration is the slope of the velocity curve at a certain point. This is also the magnitude if the acceleration of a free falling object near the earth s surface. Graph v vs. t and indicate how to find average acceleration on the graph.