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C-14. A block of mass 200 g is moving with a speed of 4 m/s at the highest point in a clradius 10 cm kept fixed in a vertical plane. The cross-section of the tube is such that the block just fits init. The block makes several oscillations inside the tube and finally stops at the lowest point. Find thework done by the tube on the block during the process. (g 10 m/s?)

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