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This is what I've done:

180=4.5k

k=40

force=40x

work = integral from 0 to 180 40x dx

then I took the anti derivative and it was (40x^2)/2 which ends up 20x^2

I then plugged in 180 for x

20(180)^2 = 648000

The correct answer is 72900. Any thoughts?