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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
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B
24 J
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C
2.4 KJ
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D
4.8 KJ
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Solution

The correct option is B 2.4 KJ
Kinetic 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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