1. The problem statement, all variables and given/known data Starting from rest, a 5.0 kg block slides 2.5 m down a rough 30.0 degree incline in 2.0 seconds. Determine the following: a. work down by the force of gravity b. the mechanical energy lost due to friction c. the work done by the normal force between the block and the incline 2. Relevant equations I think Wnet = Fnetd(cos thata) is relevant. KE = 1/2mv^2 and PEg = mgh 3. The attempt at a solution I started by drawing a force diagram...49.1 N pointing downards and a 30 degree angle drawn in. I know that I need to figure out Forcenet but I'm not sure how. I would attempt more of a solution but I'm honestly just that bad at physics. I've worked all week and I have an exam on Friday, but I'm still clueless. Help is really needed here. I want to understand.