We know that KE=9J and the Mass (m) = 1kg. The formula to find this is going to be our Kinetic Energy Equation. K=\(\frac{1}{2}\)m\(v^{2}\). But we will rearrange it to find the veloctiy so it looks like this: v=\(\sqrt{\frac{2K}{m} }\). Then just plug in the variables and solve.
