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Q. A small block on a frictionless, horizontal surface has a mass of 2.80×10-2. It is attached to a massless cord passing through a hole in the surface. The block is originally revolving at a distance of 0.300 from the hole with an angular speed of 1.95. The cord is after that pulled from below, shortening the radius of the circle in which block revolves to 0.15. Model the block as a particle.

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