# A train of weight, 3.7x106 N is moving at a speed of 40.8 m/s. Determine its Kinetic energy ?

Oct 29, 2015

$314 , 24 M J$

#### Explanation:

${E}_{k} = \frac{1}{2} m {v}^{2}$

$= \frac{1}{2} \left(\frac{W}{g}\right) {v}^{2}$ here W is the weight of the train, so that we could calculate for its mass

inserting the variables,
$= \frac{1}{2} \left(\frac{3 , 7 \times {10}^{6}}{9 , 8}\right) {\left(40 , 8\right)}^{2}$

$= 314 , 24 M J$