I was just wondering the other day, many of the VCE physics formulas are derived from very simple equations, e.g. the 5 formulas dealing with constant acceleration and etc...

however no textbooks i've come across to have shown the workings to

obviously you do not need that for the course, but just out of curiosity, where is this formula derived from? if at all??

i tried substituting stuff to

, but most of it ended nowhere...

this was what i got...

given that

therefore

given that

and i'm stuck....

Thanks!!