An engine develops 10 kW of power. How much time will it take to lift a mass of 200 kg to a height of 40 m. ( $g = 10 m / s e c^{2}$ )

4 sec

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5 sec

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8 sec

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10 sec

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Solution

The correct option is C
8 sec

$P = \frac{m g h}{t} = 10 \times 10^{3} \Rightarrow t = \frac{200 \times 40 \times 10}{10 \times 10^{3}}$ = 8 sec

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