Why won’t the boat budge if the person sitting in it presses with some force on board? Why will the boat start moving if a person outside the boat acts on it with the same force?
The boat will not budge if the person sitting in it presses with some force on the board, because in this case, the person does not exert external influence on the system. If a person gets out of the boat and pushes it from the outside, then the person will push off the ground and exert an external influence, and the boats will start moving.
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