A 3.57 kg block is drawn at constant speed 4.06m along ahorizontal floor by a rope. The force on the block from therope has a magnitude of 7.68 N and is directed 15.0 degrees abovethe horizontal. What are
(a) the work done by the rope's force,
(b) the increase in thermal energy of the block-floorsystem, and
(c) the coefficient of kinetic friction between theblock and floor?