In order to calculate the kinetic energy, we can use the formula below:
[tex]KE=\frac{mv^2}{2}[/tex]Where KE is the kinetic energy (in J), m is the mass (in kg) and v is the velocity (in m/s).
So, using m = 25 kg and v = 7.9 m/s, we have:
[tex]\begin{gathered} KE=\frac{25\cdot7.9^2}{2}\\ \\ KE=780.125\text{ J} \end{gathered}[/tex]