the question is very poorly worded ... apparently, the author meant for the applied force to be 20 degrees relative to both the incline and the horizontal surface ...
J
A 35-kg trunk is dragged 10 m up a ramp inclined at an angle of 12 degrees to the horizontal by a force of 90 N applied at an angle of 20 degrees to the ramp. At the top of the ramp, the trunk is dragged horizontally another 15 m by the same force. Find the total work done.
My work:
W=90(15)cos32
=1144.86
W=343(10)cos78
=713
713+1144.86
=1857.9971
The answer in the book is 2114 J. How do I get this?