On a windless day, a sailor(m = 75 kg) decides he wants to go sailing in his sailboat (m = 300 kg). In order to move on this windless day, he decides to mount a powerful battery-operated fan (m = 20 kg) on the back of his sailboat and points the running fan at the sail. The fan can deliver air that pushes against the sail to the right with a constant force of 300 N.
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