Final answer:
Newton's Third Law of Motion is best demonstrated by two tug boats pushing a cruise liner, which begins to move forward; the action and reaction force must be equal and opposite according to the law.
Step-by-step explanation:
Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. This means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The forces are directed in opposite directions.
From the given scenarios, the application of Newton's Third Law of Motion is best illustrated by:
B.
A cruise liner has lost power and can't get into port. Two
tug boats push at the back
of the ship and the ship begins to move forward toward the dock.
This example showcases the action and reaction force pairs: tug boats push the cruise liner forward (action), and the cruise liner pushes back on the tug boats with equal force (reaction), resulting in the movement of the ship.