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Q.

What is kinetic energy of each cubic meter of water in a stream that is moving with speed of20m/s .

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a

106J

b

107J

c

105J

d

108J

answer is B.

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Detailed Solution

Volume =1m3

ρwater=103kgm3

ρ=mv;m=ρV=103×1=103kg

velocity = v = 20ms1

Kinetic energy=12mv2=12×103×400=2×105J

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