Which option is an example of a transverse wave? A. A sound wave
B. A wave on top of water
C. An ocean wave
D. A wave carried through a rope

It's D

Since the pully is a simple machine so the mechanical advantage is a 1

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.