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Order of Magnitude

A train of ma...

Question

A train of mass $100$ tonnes is moving with a uniform speed of $2 m s^{- 1}$ . Calculate the amount of energy possessed by the train.

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Solution

$m = 100 \times 10^{3} k g$
Energy=K.E.= $\frac{1}{2} m v^{2}$
$= \frac{1}{2} \times 10^{5} \times 4$
$E = 2 \times 10^{5} J$

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