Respuesta :

Answer:

20 joule

Step-by-step explanation:

[tex]K. E. = \frac{1}{2} m {v}^{2} \\ = \frac{1}{2} \times 10 \times {2}^{2} \\ = \frac{1}{2} \times 10 \times 4 \\ = 20 \: j[/tex]