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Power, Force and Velocity

The power of ...

Question

The power of water pump is $4 k W$ . If $g = 10 m s^{- 2}$ the amount of water it can raise in $1$ minute to a height of $20 m$ is

100 l i t r e

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1000 l i t r e

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1200 l i t r e

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2000 l i t r e

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Solution

The correct option is C $1200 l i t r e$
$P = \frac{m g h}{t}$
$m = \frac{P t}{g h}$
$\frac{4 \times 10^{3} \times 60}{10 \times 20}$
$= 1200$ litre

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