Answer:
Kinetic energy
Step-by-step explanation:
Total energy of any system is always conserved.
![E = K +U](https://img.qammunity.org/2020/formulas/physics/middle-school/lslkcm95etwe83ja4jpnqs2pt5gs1eoed7.png)
E= Total energy
K = kinetic energy
U = Potential energy
Kinetic energy is the energy acquired by the system due to the virtue of it's motion.
Potential energy is the energy acquired by the system due to the virtue of it's configuration.
Also, Kinetic energy
![K = (1)/(2) m v^(2)](https://img.qammunity.org/2020/formulas/chemistry/high-school/vhrem7217x2l3lzu0qe83e9b8geic44ubz.png)
![K = (1)/(2) * 3 * 2^(2)](https://img.qammunity.org/2020/formulas/physics/middle-school/lg9xhmkfjumwkinxs3s13tbr73r46g7yo2.png)
![K = 6 J](https://img.qammunity.org/2020/formulas/physics/middle-school/arnmfkfpw3pk2igkmbzp2xrx87e2pi9m87.png)