*해설

<문제 해설>
Nozzle에 작용하는 힘 F = γ x Q^2 x A1 / 2g x {(A1 - A2) / (A1 x A2)}^2

F = 9800 x 0.02^2 x (π/4 x 0.1^2) / 19.6 x {(π/4 x 0.1^2 - π/4 x 0.05^2) / (π/4 x 0.1^2 x π/4 x 0.05^2)}^2
= 229.1831181[m]