# Question #2a2ef

Jul 21, 2017

$K = 4 k J$

#### Explanation:

$F = m a \implies a = \frac{F}{m} \implies a = \frac{20}{5} = 4 \frac{m}{s} ^ 2$

so the velocity is : $v = a t = 4 \cdot 10 = 40 \frac{m}{s}$

The kinetic energy is then :

$K = \frac{1}{2} m {v}^{2} = \frac{1}{2} \cdot 5 \cdot 40 \cdot 40 = 5 \cdot 20 \cdot 40 = 4000 J = 4 k J$