Rod AB is held in place by the cord AC. Knowin and that c=840mm and that the moment about B of the force exerted by the cord at point A is 756 NM in the clockwise direction. Determine the tension in core AC

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.