# Question #7f373

Feb 17, 2017

$m = 1420 k g$

#### Explanation:

Kinetic energy of a moving object can be calculated from the formula

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

$m = \text{the mass of the object}$

$v = \text{the velocity}$

in this case

$1 , 136 , 00 = \frac{1}{2} \times m \times {40}^{2}$

$\therefore m = \frac{1 , 136 , 000 \times 2}{40} ^ 2$

$m = 1420 k g$