A 36 kg block of ice slides down a frictionless incline 1.2 m long and 0.48 m high. A worker pushes up against the ice, parallel to the incline, so that the block slides down at constant speed. (a) Find the magnitude of the force exerted by the worker. (b) Find the work done on the block by the workers force. (c) Find the work done on the block by the weight of the block. I found the answer to (a) by sin(arcsin(.48/1.2)) * 9.81 * 36 kg which is 141.2629. I don't know what to do for (b) and (c). My first guess would be that (b) is -141.2629 and (c) is 141.2629. But im not sure.