Ablock of mass \(1 \mathrm{~kg}\) slides down a curved track which forms one quadrant of a circl....

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Ablock of mass \(1 \mathrm{~kg}\) slides down a curved track which forms one quadrant of a circle of radius \(1 \mathrm{~m}\) as shown in figure. The speed of block at the bottom of the track is \(v=2 \mathrm{~ms}^{-1}\). The work done by the force of friction is
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