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x=400/cos 30
x=400/(1/2√3)
x=(800√3)/3 m
-400 = 20 . sin 30 . t - 1/2 . 10 . t^2
-400 = 10 . t - 5 t^2
5 t^2 - 10 t - 400 = 0
t^2 - 2t - 80 = 0
(t - 10)(t+8) = 0
t = 10 s
X = Vox . t
= 20 . cos 30 . 10
= 20 1/2 .10
= 100 meter