I am having real trouble understanding friction force. Work I understand. I just don't know how to put them together. Some help would be highly appreciated. A 16.1 kg block is dragged over a rough, horizontal surface by a constant force of 118 N acting at an angle of 25 degrees above the horizontal. The block is displaced 78.6 m, and the coeficient of kinetic friction is 0.228. The acceleration of gravity is 9.8 m/s2. a.) Find the work done by the 118 N force. Answer in units of J. - I've already found this to be 8405.82346 J b.) Find the work done by the force of friction. Answer in units of J. c.) If the block was originally at rest, determine its final speed. Answer in units of m/s2.