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51 lines
1.7 KiB
Python
51 lines
1.7 KiB
Python
"""
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Find the kinetic energy of an object, given its mass and velocity.
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Description : In physics, the kinetic energy of an object is the energy that it
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possesses due to its motion.It is defined as the work needed to accelerate a body of a
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given mass from rest to its stated velocity.Having gained this energy during its
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acceleration, the body maintains this kinetic energy unless its speed changes.The same
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amount of work is done by the body when decelerating from its current speed to a state
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of rest.Formally, a kinetic energy is any term in a system's Lagrangian which includes
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a derivative with respect to time.
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In classical mechanics, the kinetic energy of a non-rotating object of mass m traveling
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at a speed v is ½mv².In relativistic mechanics, this is a good approximation only when
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v is much less than the speed of light.The standard unit of kinetic energy is the
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joule, while the English unit of kinetic energy is the foot-pound.
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Reference : https://en.m.wikipedia.org/wiki/Kinetic_energy
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"""
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def kinetic_energy(mass: float, velocity: float) -> float:
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"""
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Calculate kinetic energy.
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The kinetic energy of a non-rotating object of mass m traveling at a speed v is ½mv²
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>>> kinetic_energy(10,10)
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500.0
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>>> kinetic_energy(0,10)
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0.0
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>>> kinetic_energy(10,0)
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0.0
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>>> kinetic_energy(20,-20)
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4000.0
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>>> kinetic_energy(0,0)
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0.0
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>>> kinetic_energy(2,2)
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4.0
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>>> kinetic_energy(100,100)
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500000.0
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"""
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if mass < 0:
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raise ValueError("The mass of a body cannot be negative")
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return 0.5 * mass * abs(velocity) * abs(velocity)
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if __name__ == "__main__":
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import doctest
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doctest.testmod(verbose=True)
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