It takes a crane $2.0\,\text{minutes}$ to raise a $500\,\text{kg}$ load to the roof of a building that is $12\,\text{m}$ high. Calculate the useful power developed against gravity by the crane.
- A$21\,\text{W}$
- B$50\,\text{W}$
- C$500\,\text{W}$
- D$30\,000\,\text{W}$