A boy needs $0.60\ \text{s}$ to raise a book with mass $0.60\ \text{kg}$ from the top of a desk and set it on a shelf. The desk top is $0.80\ \text{m}$ above the floor, while the shelf is $1.7\ \text{m}$ above the floor. The gravitational field strength is $10\ \text{N kg}^{-1}$. Which power does the boy develop?
- A$0.9\ \text{W}$
- B$1.7\ \text{W}$
- C$9.0\ \text{W}$
- D$17\ \text{W}$