Posted by **tom** on Wednesday, December 1, 2010 at 8:10pm.

A 3.2 kg block is hanging stationary from the end of a vertical spring that is attached to the ceiling. The elastic potential energy of this spring/mass sytem is 2.1 J. What is the elastic potential energy of the system when the 3.2 kg block is replaced by a 5.3 kg block?

- honors physics -
**bobpursley**, Wednesday, December 1, 2010 at 8:13pm
find k for the initial block.

Weight= kx when

2.1J=1/2 kx^2 or

mg=kx and

4.2J=kx^2 or

4.2=mg*x solve for x

know, knowing x, solve for k.

replace the mass, find new x.

PE= 1/2 k (newx)^2

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