Leonardo da Vinci suggested a flying machine that would operate in the manner of a screw, raising the pilot into the air. The pilot turns the ‘screw’. The combined mass of the machine and the pilot is $120\,\text{kg}$. What useful output power must the pilot supply to travel vertically upward at a steady speed of $2.5\,\text{m s}^{-1}$?
- A$48\,\text{W}$
- B$300\,\text{W}$
- C$470\,\text{W}$
- D$2900\,\text{W}$