A ball of mass m is attached to a string of length L and released from rest
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A ball of mass m is attached to a string of length L and released from rest at the point A in FIGURE 8-41.
(a) Show that the tension in the string when the ball reaches point B is 3mg, independent of the length l.
(b) Give a detailed physical explanation for the fact that the tension at point B is independent of the length l.
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