Question

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

Answer 1

$m=100\times {10}^{3}kg$

Energy=K.E.=$\frac{1}{2}m{v}^2$

$=\frac{1}{2}\times {10}^5\times 4$

$E=2\times {10}^{5}J$