A small ball is suspended from point O by a thread of length l. A nail is driven into the wall at a distance of l/2 below O

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A small ball is suspended from point O by a thread of length l. A nail is driven into the wall at a distance of l/2 below O, at A. The ball is drawn aside so that the thread takes up a horizontal position at the level
03
Oct
A small ball is suspended from point O by a thread of length l. A nail is driven into the wall at a distance of l/2 below O, at A. The ball is drawn aside so that the thread takes up a horizontal position at the level A small ball is suspended from point O [...]
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