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September 22, 2014

September 22, 2014

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

- honors physics -
**bobpursley**, Wednesday, December 1, 2010 at 8:13pmfind 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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