A sailing boat can sail faster than the wind.
Every moving vehicle creates wind, and so does a sailing boat.
By adjusting the angle of the sail, a yacht can take advantage of this extra wind. It can then reach a maximum which is well over the real wind speed. If the boat is running before the wind, the propulsive force is an impulse force produced by changing the direction of movement of the air as it hits the sail. The sail and the mass of the boat acting through the sail provides a force to deflect the air at right angles. The resultant reaction force moves the boat along.