Question

# A river of salty water is flowing with a velocity 2 m/ sec. If the density of the water is $$1200 kg/m^3$$, then the kinetic energy of each cubic meter of water is

A
2.4 J
B
24 J
C
2.4 KJ
D
4.8 KJ

Solution

## The correct option is B 2.4 KJKinetic energy per cubic meter is $$=\dfrac {1}{2}\rho v^2$$ $$=\dfrac {1}{2}\times1200\times 2^2=2400\ J=2.4\ KJ$$Physics

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