• We can write equations for the movement of an object, if it has a constant acceleration (a), over a distance (s) in a time (t), with initial velocity (u), and final velocity (v).

• We have a simple equation that we know already:

a = (v-u)/t, or in other words: v = u + at

• We can add to these a few more:

s = ut + ½at²

v² = u² + 2as

• We can also modify these to get some extra equations, e.g:

s = vt - ½at²

s = ½(u+v)t

u² = v² - 2as

• By these means we can calculate all 5 of the parameters if we know 3.