(a) Calculate the approximate force on a square meter of sail, given the horizontal velocity of the wind is 6.00 m/s parallel to its front surface and 3.50 m/s along its back surface. Take the density of air to be 1.29 kg/m³. (The calculation, based on Bernoulli's principle, is approximate due to the effects of turbulence.)

(b) Discuss whether this force is great enough to be effective for propelling a sailboat.