An athlete jumps straight upwards at 2.5 m/s, find: 1. a) total flight time 2. b) maximum jump height
h = 0 + 2.5 t - 4.9 t^2
0 = 0 +2.5 t - 4.9 t^2
4.9 t^2 - 2.5 t = 0
t (4.9 t - 2.5) = 0
t = 2.5/4.9
at max height, half that time
h = 2.5(1.25/4.9) - 4.9(1.25/4.9)^2