The power required to lift a mass of 8.0\text{ kg} up a vertical distance of 4\text{ m} in 2\text{ s} is (taking acceleration due to gravity as 10\text{ m/s}^{2}) :
- A. 80\text{ W}
- B. 160\text{ W} ✓
- C. 320\text{ W}
- D. 640\text{ W}
Correct Answer: B. 160\text{ W}
Explanation
Power P = \frac{Work}{Time} = \frac{mgh}{t} = \frac{8.0 \times 10 \times 4}{2} = 160\text{ W}.
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