Answer:
The boat pushes back on the girl with an equal force of 100N
Explanation:
Newton's third law of forces explains that action and reaction are equal and opposite. This means that for every action of a force, there is an equal but opposite reaction.
In our case, as the girl pushes on the boat with a force of 100N, the boat pushes back with a force of 100N also, following Newton's third law
