Ablock moves up a 30 degree incline under the action of three applied forces. f1 is horizontal and of magnitude 40 n. f2 is normal to the plane of the incline and has magnitude of 20 n. f3 is parallel to the plane and of magnitude 30 n. determine the work done by the forces as the block (and point of application of each force) moves 80 cm up the incline. (answer in j)

Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.