find the kinetic energy of an object given its mass and velocity description in physics the kinetic energy of an object is the energy that it possesses due to its motion it is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity having gained this energy during its acceleration the body maintains this kinetic energy unless its speed changes the same amount of work is done by the body when decelerating from its current speed to a state of rest formally a kinetic energy is any term in a system s lagrangian which includes a derivative with respect to time in classical mechanics the kinetic energy of a nonrotating object of mass m traveling at a speed v is mv 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 the joule while the english unit of kinetic energy is the footpound reference https en m wikipedia orgwikikineticenergy calculate kinetic energy the kinetic energy of a nonrotating object of mass m traveling at a speed v is mv kineticenergy10 10 500 0 kineticenergy0 10 0 0 kineticenergy10 0 0 0 kineticenergy20 20 4000 0 kineticenergy0 0 0 0 kineticenergy2 2 4 0 kineticenergy100 100 500000 0 calculate kinetic energy the kinetic energy of a non rotating object of mass m traveling at a speed v is ½mv² kinetic_energy 10 10 500 0 kinetic_energy 0 10 0 0 kinetic_energy 10 0 0 0 kinetic_energy 20 20 4000 0 kinetic_energy 0 0 0 0 kinetic_energy 2 2 4 0 kinetic_energy 100 100 500000 0
def kinetic_energy(mass: float, velocity: float) -> float:
    
    if mass < 0:
        raise ValueError("The mass of a body cannot be negative")
    return 0.5 * mass * abs(velocity) * abs(velocity)


if __name__ == "__main__":
    import doctest

    doctest.testmod(verbose=True)