Speed or rate r is a scalar quantity that measures the distance traveled d over the change in time Dt represented by the equation r dDt. You walk from home to the shop in 100 seconds what is your speed and what is your velocity. When we take the limit as Dt0 then it becomes dydt the average velocity turns into instantaneous velocity at time t.
Q V t Q V t where V is the volume and t is the elapsed time.
So the velocity is the change in the position of an object divided by the time. Mathematically the velocity is the ratio of the objects displacement and time. Most physics and math formulas build on things youve already learned. Va y0Dy y0 Dt where y0 is the position of an object at time t and y0Dy is its position in the same direction after an increase of time by Dt.