1/2*m*v2 1/2*m*v2, 1/2*mv 2 1/2*m*v2. There are any references about 1/2*m*v2 in here. you can look below. 1/2*m*v21/2*m*v2 1/2*mv 21/2*mv 21/2*m*v2, 1/2*mv 2