10.9#8

Hi, I have tried using the equation F(t) = -mw^2(acos(wt), asin(wt)). It has worked, im not sure what else to try. Thanks

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That's a nice formula you have, and a true and applicable formula, assuming by "a" you mean the radius of the circle.  Too bad you didn't use it.  I can tell because that formula depends on t, as it should because it has to point in different directions at different positions, but the answer you wrote doesn't depend on time at all. I suggest you would be well rewarded by trying understand that formula more deeply.