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.$ ............. $sec$ $(g = 10\,m/{\sec ^2})$
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.$ ............. $sec$ $(g = 10\,m/{\sec ^2})$
$4$
$5$
$8 $
$10 $
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.$ ............. $sec$ $(g = 10\,m/{\sec ^2})$
$P = \frac{{mgh}}{t} = 10 \times {10^3}$$⇒$ $t = \frac{{200 \times 40 \times 10}}{{10 \times {{10}^3}}}$$ = 8\,\sec $
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