What do the sounds of a basketball bouncing and a dog barking have in common?

A. Both require a medium to travel through.
B. Both require a human eardrum in order to be
heard.
C. Both have the same amplitude.
D. Both have the same frequency.

The answer is trial 3.

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.

Answerdensity