Create kinetic_energy.py (#7620)

* Create kinetic_energy.py

Finding the kinetic energy of an object,by taking its mass and velocity as input

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* Update kinetic_energy.py

* Update kinetic_energy.py

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Christian Clauss <cclauss@me.com>