Question

A river is flowing at a speed 4m/s . The K.E of cubic metre of water is​

Answer 1

Answer:

K.E. = 8000 J .

Explanation:

Given  :

speed = 4 m / sec

$\large mass (m)=density\times volume\\\\\\\large mass(m)=1000 \ kg/m^3\times1 \ m^3\\\\\\\large mass(m)=1000 \ kg$

We know that

$\large Kinetic \ energy=\dfrac{1}{2} \ mv^2$

Now putting values in formula we get

$\large Kinetic \ energy=\dfrac{1}{2}\times1000\times4^2\\\\\\\large Kinetic \ energy=\dfrac{1}{2}\times1000\times4\times4\\\\\\\large Kinetic \ energy=1000\times4\times2 \ J\\\\\\\large Kinetic \ energy=8000 \ J$

Thus we get answer K.E. = 8000 J .

Answer 2

Answer:

K.E = 80000J

Explanation:

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