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A certain toy ball has springs inside, so that pushing a small button releases these springs inside. The ball is initially at rest. The springs propel three pieces of the ball, of mass m1, m2 and m3. The velocities of m1 and m2 are (vx, vy, vz) and (ux, uy, uz), respectively.
1) What is the velocity w~ of m3?
2) What is the final total kinetic energy?
3) What was the original potential energy of the springs? Explain why
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