Rays of light enter and leave a box as shown below. What could be inside the box to make the rays behave as shown? Justify your answer by drawing the appropriate diagram.

Your answer is 1.5 hope i  

If its history of, then b) because a) implies only present day (now)

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.