If water is flowing in a pipe with speed $2 \,m / s$ then its kinetic energy per unit volume is ........... $J ^2 m ^3$
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(d)
$\frac{ EK }{ V }=\frac{1}{2} \rho V ^2$
$=\frac{1}{2} \times 1000 \times 2^2$
$=\frac{1}{2} \times 1000 \times 4$
$=2000\,J / m ^3$
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