The Work-Energy theorem in mechanics relates the kinetic energy
of a body at two positions to the work done on the body during its motion
from some position 1 to a second position 2 along some specified path.
K2 = K1
+ W12
where
K2 = 0.5*m*v2^2
,
K1 =0.5*m*v1^2
and W12
= net work done by all forces on the body from position 1 to position
2 along the specified path