A block weighing 10 N is released from rest at point A on a track which is one quadrant of a circle of r=1.2 m

It slides down the track and reaches point B with a velocity of 3.60 m/s. From point B it slides on a level surface a distance of 2.70 m to point C, where it comes to rest. (a) What was the coefficient of sliding friction on the horizontal surface? (b) How much work was done by friction as the body skid down the circular arc from A to B?