A square plywood platform has a perimeter which is 7 times the length of a side, decreased by 18. Find the length of a side.

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A square plywood platform has a perimeter which is 7 times the length of a side, decreased by 18. Find the length of a side.

First do the kinetic formula, KE=1/2mv². The kinetic energy is 1300 so it is 1300=1/2m(35)² 1300=1/2m(1225) Can someone tell if I'm doing this right I'm not sure on the...

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First do the kinetic formula, KE=1/2mv². The kinetic energy is 1300 so it is 1300=1/2m(35)² 1300=1/2m(1225) Can someone tell if I'm doing this right I'm stuck on the next step

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