kinetic energy
The kinetic energy of an object is the energy that it possesses due ti its motion.
It is defined as the work needed to accelerate a body of a given mass from rest to its state velocity.
This energy during its acceleration having gained, the body maintains this kinetic energy unless its speed changes.
The same amount of work is done by the body in decelerating from its current speed to a state of rest.
The kinetic energy of a non–rotating object of mass m traveling at a speed v is 1/2mv2
In relativistic mechanics, this is a good approximation only when v is much less than the speed of light.
The standard unit of kinetic energy is joule.