hello, totally new here
and i'm having trouble deriving the equation out of this question...
so here's the question:
Alex was practising his 10m platform dive (i'm assuming that it means, he's above the water by 10m?). Because of gravity, the relation between his height, h, in metres, and the time, t, in seconds, after he dives is quadratic. If Alex reached a maximum height of 11.225m after 0.5 seconds, how long was he above the water after he dove?
So.. i think i'm supposed to find the 2 roots to solve?
thank you guys !