Problem $3$:

An airfoil is in a freestream where $p_{}=0\mathrm{.}61$atm,${}_{}=0\mathrm{.}819k\frac{g}{m^3},$ and $V_{}=300\frac{m}{s}.$ At a point on the

airfoil surface, the pressure is $0\mathrm{.}5$ atm $.$ Assuming isentropic flow, calculate the velocity at that point.