The free body diagram below shows the forces acting on the bob when it spins at a rate such that it hangs vertically as shown. F⃗ s, F⃗ e and W⃗  are the force due to the string, the force due to the elastic band, and the weight of the bob respectively. Mark all the correct statements below.   Select one or more: a. F⃗ e is the centripetal force b. F⃗ s+W⃗ =0 c. F⃗ e+W⃗  is the centripetal force

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