Remember the equation for kinetic energy?
[tex]kinetic = \frac{1}{2} m {v}^{2} [/tex]
From the question, we know that:
Mass, m = 7kg
Velocity, v = 4 m/s
All you need to do is plug those values into the equation and you'll get its kinetic energy in units of Joules (J). Tadaa!
[tex]kinetic = \frac{1}{2} (7) {(4)}^{2} [/tex]
