A man weighing 80 kg climbs a staircase carrying a 20 kg load. The staircase has 40 steps each of 25 cm height. If he takes 20 seconds to climb, the work done is

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9800 J

490 J

98 × 10⁵ J

7840 J

answer is A.

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Detailed Solution

$\begin{aligned} m = 80 + 20 = 100 kg \\ g = 9.8 m / s^{2} \\ h = 25 \times 40 = 1000 cm = 10 m \\ P \cdot E = W ork Done = 100 \times 9.8 \times 10 = 9800 J \end{aligned}$

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