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kinetic energy-

[[image:http://www.explainthatstuff.com/yoyoenergy.gif width="370" height="294" caption="when the yoyo rotates it has kinetic energy.(google.com)"]]
Kinetic energy increases as the square of the speed. More energy means more forces need to stop. Energy as the capacity for doing work is a convertible currency. To give something kinetic energy you must do work on it. This development uses the concept of work as well as Newton's second law and the motion equations.
 * Formula: K=1/2mv²**

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