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A block weighing \( 1 \mathrm{~kg} \) is released from rest at point \( A \) on a track which is one quadrant of a circle of radius \( 1.2 \mathrm{~m} \) as shown in figure-4.144. It slides down the track and reaches point \( B \) with a velocity of \( 3.6 \mathrm{~m} / \mathrm{s} \). From the point \( B \) it slides on a level surface a distance of \( 2.7 \mathrm{~m} \) to point \( C \), where it comes to rest, (a) What was the coefficient of friction on the horizontal surface? (b) How much work was done against friction as the body slid down the circular track from \( A \) to \( B \) ?
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