If for every action force an equal and opposite reaction force exists, how can anything ever be accelerated?
the action and reaction forces act on different objects, therefore the net force is not always zero
the action force, when accelerating, is greater than the reaction force.
the reaction force is not always in the same vector direction as the action force.
onone of the above

Afisherman notices that his boat is moving up and down periodically, owing to waves on the surface of the water. it takes a time of 2.70 s for the boat to travel from its highest point to its lowest, a total distance of 0.700 m. the fisherman sees that the wave crests are spaced a horizontal distance of 6.50 m apart. a. how fast are the waves traveling? b. what is the amplitude a of each wave?