Excited at the prospect of assisting some students with M3!
How to use SUVAT. My friend jumps from a height of 85m, the bungee is taut at 80m – what is her maximum velocity?
Use v²=u²+2as. u is initial velocity(zero obviously!!), a is acceleration(Newton discovered this, use 10m/s²) and assume no air resistance. Now all you have to do is convert to something meaningful like Km/hour or miles/hour.