Respuesta :

r3t40
Kinetic energy possessed by moving train is [tex]E_k = 150000J[/tex].

And mass [tex]m = 10000kg[/tex].

The formula for kinetic energy is [tex]E_k = \frac{m\times v^2}{2}[/tex].

Solve for velocity:

[tex]E_k = \frac{m\times v^2}{2}\implies 2E_k = m\times v^2[/tex]

[tex]v^2=\frac{2E_k}{m}\implies \underline{v = \sqrt{\frac{2E_k}{m}}}[/tex]

Now put in the data:

[tex]v = \sqrt{\frac{2\times150000J}{10000kg}}\approx5.48\frac{m}{s}[/tex]

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