Question

Why does the boat tends to leave the floor when passenger is enlightening from it?

Answer 1

Explanation:

You do not understand the third law. If there are two objects, A and B, and A exerts a force on B, Newton's third law says that B exerts a force of equal magnitude and opposite direction on A. So, you see, the two forces are not on the same object and are therefore not "balanced".

Answer 2

Explanation:

After the boat has reached the shore, and is stationary, for allowing the passenger to disembark, the momentum of the boat and passenger/s is zero. When you jump of the boat, with some velocity, you have some forward momentum

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