Energy
Types of Energy?
Kinetic energy      K = 1/2 m v2
SI Unit of Kinetic energy ( and every other type of energy )  is  Joule (J)
1 Joule = 1 J = 1 kg m/s2
e.g The kinetic energy of a flying duck of mass m = 3.0 kg at 2.0 m/s is 6 J.