So now we have the equations:
All three have t in them  it would be useful to get rid of it. Starting with the first equation, we can write: t = (vu)÷a. This can be substituted into the second: s = ½ (u+v) t
Expanding the brackets, and multiplying out the ½ and a: 2as = (u+v)(vu)
This rearranges to: v² = u² + 2as
