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ya a little

i'll get 21.5x = 405x^2 know what?

elastic potential energy is give by 1/2 kx^2. So how can you get 405x^2 ?

*given

* 200 x^2

there you go. So now, all you have to do is... simplify.

that's the part i have trouble with

Just cancel 1 'x' on both sides.

oh ya

so it would be 11 cm?

yep. 10.75 cm.

ok thanks a lot

:)