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Given: A large spherical mass M is fixed at one position and 2 identical point mass m are connected by a mass-less rod of length and kept in a linear position with M on the x-axis. When the left mass m is at a distance R=3l, the tension=0 for m=k(M/288).
Find: k=? (k can be any number between 1 and 9, inclusively.)

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