Starting from rest, a 4.5 kg block slides 2.5 m down a rough 30.0° incline. The coefficent of kinetic friction between the block and the incline is µk = 0.436. (a) Determine the work done by the force of gravity. J (b) Determine the work done by the friction force between block and incline. J (c) Determine the work done by the normal force.J I am not sure how to go about solving this and the teacher decided to not explain half the things saying that we dont really need it but she goes and post question on things she decided to skip. I know that i would use this formula W = (FcosTheta)DeltaX but not so sure. Any help at all would be very helpful.