A body of mass m moves under the influence of a force(adsbygoogle = window.adsbygoogle || []).push({}); Fin two dimensions. It has an trajectory

r(t) = aCos(wt)x^ + bSin(wt)y^

a = alpha

b = beta

w = omega, they are not a, b, and w in alphabet

x^,y^: vector unit

a,b,w are constant. Find the force law F = F(r) which corresponds to this motion (This trajectory is an ellipse, but not Keplerian ellipse. Newton's Law of Gravitaion is not the force law you seek here).

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# Homework Help: A confusing question

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