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A 1 kg mass is projected down a rough ci...

A `1 kg` mass is projected down a rough circular track `(radius = 2.0 m)` placed in vertical plane as shown. The speed of the mass at point `A` is `3 m//s` and at point `B`, it is `6.0 m//s`. How much is work is done on the mass between `A` and `B` by the force of friction?

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