On a windless day, a sailor(m = 75 kg) decides he wants to go sailing in his sailboat (m = 300 kg).

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.

  1. (7A) If the sailboat is at rest and if the sailor runs the fan for 10 s, what will be the velocity of the boat at the end of the 10 seconds?
  2. (7B) Would the sailor travel faster with the sail down or the sail up?

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