To find the kinetic energy, we have to use the following formula
[tex]K=\frac{1}{2}\cdot m\cdot v^2[/tex]Where m = 15 kg and v = 20 m/s.
[tex]\begin{gathered} K=\frac{1}{2}\cdot15\operatorname{kg}\cdot(20m/s)^2 \\ K=\frac{1}{2}\cdot15\operatorname{kg}\cdot400m^2/s^2 \\ K=3,000J \end{gathered}[/tex]