Acceleration [tex]a[/tex] is the variation of velocity [tex]V[/tex] over time [tex]t[/tex].
[tex]a=\frac{\Delta V}{\Delta t}[/tex]
Now, it is said that a body has a positive acceleration, when the velocity of the body increases, that is, when the final velocity is greater than the initial velocity.
It is then said that it is an accelerated movement.
