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Posted by on Monday, March 26, 2012 at 3:08am.

A child's pogo stick stores energy in a spring with a force constant of 2.5×104N/m. At position A, the spring
compression is a maximum and the child is momentarily at rest. At position B, the spring is in its equilibrium position and the child is moving upward. At position C, the child is again momentarily at rest at the top of the jump. The combined mass of child and pogo stick is 25.0 kg. If xA is 10cm below the line shown find out the distance xC.

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