A small block with mass $0\mathrm{.}0450$ kgkg slides in a vertical circle of radius $0\mathrm{.}550$ mm on the inside of a circular track. During one of the revolutions of the block, when the block is at the bottom of its path, point AA$,$ the magnitude of the normal force exerted on the block by the track has magnitude $4\mathrm{.}00$ NN $.$ In this same revolution, when the block reaches the top of its path, point BB$,$ the magnitude of the normal force exerted on the block has magnitude $0\mathrm{.}665$ NN $.$

Part A

Part complete

How much work was done on the block by friction during the motion of the block from point AA to point BB$?$