A boy pulls a sledge across a horizontal surface by means of a rope attached to it, and the sledge moves with constant velocity. The rope has a tension of $100\ \text{N}$ and is kept at $30^{\circ}$ above the horizontal. What amount of work does the boy do on the sledge as it is pulled a distance of $5.0\ \text{m}$ along the surface?
- A$250\ \text{J}$
- B$290\ \text{J}$
- C$430\ \text{J}$
- D$500\ \text{J}$