Answer:
[tex]\large\boxed{\large\boxed{5.391m/s}}[/tex]
Explanation:
The kinetic energy, KE, of a moving object is given by the formula:
[tex]KE=\dfrac{1}{2}mv^2[/tex]
Where:
Solve for v, substitute and compute:
[tex]v=\sqrt{\dfrac{2\times KE}{m}[/tex]
[tex]v=\sqrt{\dfrac{2\times 125.6J}{8.642kg}[/tex]
[tex]v=5.391m/s[/tex]