Unformatted text preview: ) (2 x 106 ) / 0.05 = 0.3596 J When the balls are very far apart, the r in the equation for potential energy will be large, making the potential energy negligibly small. Energy is conserved, so the kinetic energy at the end is equal to the potential energy at the start: The masses are known, but the two velocities are not. To solve for the velocities, we need another relationship between them. Because no external forces act on the system, momentum will also be conserved. Before the string is cut, the momentum is zero, so the momentum has to be zero all the way along. The momentum of one ball must be equal and opposite to the momentum of the other, so: Plugging this into the energy equation gives:...
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 Fall '10
 DavidJudd
 Physics, Charge, Energy, Kinetic Energy, Mass, Potential Energy, Special Relativity, 0.3596 J

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