Q17 (2024)
The power of a crane, which lifts a mass of 1000 kg to a height of 20 m in 10 s is: $\left(\mathrm{g}=9.8\ \mathrm{m}/\mathrm{s}^{2}\right)$
- 19.6 W
- 39.2 W
- 39.2 kW
- 19.6 kW
### Related Formula
$$P = \frac{W}{t} = \frac{mgh}{t}$$
### Core Logic
$$P = \frac{1000 \times 9.8 \times 20}{10} = 19600 \text{ W} = 19.6 \text{ kW}$$
### Pattern Recognition
Gravitational potential work divided by time gives mechanical power.
### Evaluation Rubric / Model Answer
null
### Chapter Mix
Class 11 Physics: Work, Energy and Power
