@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 m/s·360s+0,5·(-9,82 m/s^2 )·(360s)^2=954504m
v^2=2a·Δs⇔2·9,82 m/s^2 ·954504m≈1,874646·10^7 m^2/s^2
v=√(v^2 )⇔√(1,874646·10^7 m^2/s^2 )=4329,718235636125 m/s
E_kin=1/2 mv^2⇔1/2·100kg·(4329,718235636125 m/s)^2≈
9,37323·10^8 J