"F = 900N \\\\\nd = 5cm = 5 \\cdot 10^{-2}m\\\\\n\\rho = 1000 \\frac{kg}{m^3} \\\\\n\\pi \\approx 3.14"
"F_p = F_w = F"
Newton's second law => "F\\Delta t = mv" (*)
Where "m = V\\cdot\\rho", because of "V = S\\cdot h = S\\cdot v\\Delta t = \\pi\\cdot (\\frac{d}{2})^2 \\cdot v\\Delta t"
"v^2 = \\frac{F}{\\rho \\pi \\cdot (\\frac {d}{2})^2} = \\frac{900N}{1000\\frac{kg}{m^3} \\cdot 3.14 \\cdot (\\frac {5 \\cdot 10^{-2}} {2})^2m^2} = 458.5987 (\\frac{m}{s})^2"
Then the answer:
"v = 21.415 \\frac{m}{s}"(*):
"F = ma \\\\\nF = m\\frac{v - 0}{\\Delta t} \\\\\nF \\Delta t = mv"
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