The block of mass \(1\ kg\) slides down a curved track which forms one quadrant of a circle of r...

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