A block of mass 100 g is moved with a speed of `5(m)//(s)` at the highest point in a

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A block of mass 100 g is moved with a speed of `5(m)//(s)` at the highest point in a closed circular tube of radius 10 cm kept in a vertical plane. The cross-section of the tube is such that the block jst fits in it. The block makes several oscillations inside the tube and finally stops at the lowest point. The work done by the tube on the block during the process will be
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Question Mein friction ya frictionless ke bare mein Kuchh Nahin bataya hai

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