Posted by **Lynn** on Tuesday, January 26, 2010 at 9:30pm.

A 2.8-kg block is hanging stationary from the end of a vertical spring that is attached to the ceiling. The elastic potential energy of the spring/mass system is 1.2 J. What is the elastic potential energy of the system when the 2.8-kg block is replaced by a 5.4-kg block?

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**bobpursley**, Tuesday, January 26, 2010 at 9:45pm
The elastic spring energy is related to distance stretched squared. But distance stretched is proportional to force.

Here force doubles, so distance stretched doubles, so PE in the spring doubles squared.

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