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

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A block 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
\( -(a)+4 \mathrm{~J} \)
(b) \( -4 \mathrm{~J} \)
(c) \( -8 \mathrm{~J} \)
(d) \( +8 \mathrm{~J} \)
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