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A uniform disc of mass 1 kg and radius 2...

A uniform disc of mass `1 kg` and radius `20 cm` is rolling purely on a flat horizontal surface. Its centre `C` is moving with acceleration `a = 20 ms^(-2)` and velocity `v =4 m//s` at a certain instant. At this instant. points `A` and `B` are located on the disc as shown in the diagram, with `AC = BC = 10 cm`.

What is the acceleration magnitude of point `A`?

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