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Use the formula for Kinetic Energy (KE), which is the energy due to the motion of an object.

KE = (1/2) * (mass) * (velocity)2

where KE is in joules, mass is in kg, and velocity (or speed) would be in meters/sec...Just substitute the appropriate numbers, rearrange and solve for velocity

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Q: How do you find the speed given joules and mass?
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