2026 Work, Energy and PowerPower as rate of doing work Easy Question 1 of 71 in Work, Energy and Power

The power of a crane, which lifts a mass of 1000 kg to a height of 20 m in 10 s is: ($g = 9.8\ m/s^2$)

A 19.6 W
B 39.2 W
C 39.2 kW
D 19.6 kW

The answer is D.

Solution

Power of crane $= \frac{mgh}{t} = \frac{1000 \times 9.8 \times 20}{10}$ $= 19.6 \times 1000$ W = 19.6 kW

Work, Energy and Power in past papers

71 questions from this chapter have appeared across 27 exam years.