Question

A river is flowing at a speed 4ms-1. The k.e of cubic meter of water is..

Answer 1

Answer:

Explanation:

Answer:

K.E. = 8000 J .

Explanation:

Given :

speed = 4 m / sec

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

We know that

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

Now putting values in formula we get

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

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