Calculate the approximate force on a square meter $(1\mathrm{.}00$ m$3)$ of sail, given the horizontal velocity of the wind is $6\mathrm{.}00$ m$/$s parallel to its front surface and $3\mathrm{.}50$ m$/$s along its back surface. Take the density of air to be $1\mathrm{.}29$ kg$/$m$3.($The calculation, based on Bernoulli$$s principle, is only approximate due to the effects of turbulence.$)$ Remember, F $=($P$2$ P$1)$A