@Mangon
It seems that the problem is with the author, @barak1997 's calculations line up pretty well with my own:
v=aτ⇔(9,82·2) m/s^2 ·180s≈3535,2·m·s^(-1)
s=s_0+v_0 τ+1/2 aτ⇔0,5·(9,82·2) m/s^2 ·(180s)^2=318168m
τ=v/a⇔(3535,2 m/s)/(9,82 m/s^2 )≈360s
s=s_0+v_0 τ+1/2 aτ⇔318168m+3535,2...