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The equation for kinetic energy is KE=(1/2)*m*v^2. With m equal to 0.725 kg (we want to convert it to kilograms so that the units work out to be kg*m^2/s^2 which is a Joule) and v equal to 20 m/s we get KE=(1/2)*0.725*20^2=145 Joules or 107 foot-pound force.

Q: What is the kinetic energy of a 725 gram volleyball that is moving at a speed of 20 meters per second?

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