Radio wave radiation falls in the wavelength region of 10.0 to 1000 meters

Two cars collide, lock bumpers and move together after the collision.this collision is known as perfectly inelastic collision.

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.