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Physics: Problems and Solutions

Kinetic energy

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Kinetic energy (symbol KE, measured in Joules) is the energy which any moving object has due to its motion. In classic physics, the formula for the kinetic energy of a moving object it

E_k = \frac{1}{2} m v^2

In rotational systems, it is equal to one half of the moment of inertia (I) times the angular velocity (ω) squared.

E_r = \frac{1}{2} I \omega ^ 2 = \frac{1}{2} L \omega

The kinetic energy of a falling body when it strikes the ground is equal to its potential energy at the height from which it was dropped.

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