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Power

An engine dev...

Question

An engine develops $10 k W$ of power. How much time will it take to lift a mass of $200 k g$ to a height of $40 m$ . [ $g = 10 m s^{- 2}$ ]

4

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Solution

The correct option is C $8$ s
$P o w e r = \frac{Δ P E}{t}$
$\Rightarrow t = \frac{Δ (P E)}{P o w e r}$ $= \frac{200 \times g \times 40}{10 \times 10^{3}} = \frac{8 \times 10^{4}}{10^{4}} = 8 s$

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