A $10 \mathrm{~kg}$ mass placed on an infinitely long horizontal massless flat platform is to be supported by a steady vertical water jet as shown in the figure. The diameter of the jet is $5 \mathrm{~cm}$. What minimum average velocity is required to hold the mass in place?
Assume $\rho_{\text {water }}=1000 \mathrm{~kg} / \mathrm{m}^{3}, g=10 \frac{\mathrm{m}}{\mathrm{s}^{2}}$ and $\pi=3.14$. Neglect friction.
(Round off to two decimal places)
