The formula for calculating kinetic energy (KE) is KE = 0.5 x mv2. Here m stands for mass, the measure of how much matter is in an object, and v stands for velocity of the object, or the rate at which the object changes its position. Your answer should always be stated in joules (J), which is the standard unit of measurement for kinetic energy. It is equivalent to 1 kg * m2/s2. If you don't know the mass or velocity of the object, then you'll have to calculate it. But let's say that you do know both quantities and are working to solve the following problem: Determine the kinetic energy of a 55 kg woman running with a velocity of 3.87m/s. Since you know the mass and velocity of the woman, you can plug it into the equation:  KE = 0.5 x mv2 KE = 0.5 x 55 x (3.87)2 Once you've plugged in the mass and velocity, you can solve for kinetic energy (KE). Square the velocity and then multiply all of the variables together. Remember to state your answer in joules (J).   KE = 0.5 x 55 x (3.87)2 KE = 0.5 x 55 x 14.97 KE = 411.675 J
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