a trunk is dragged across a level floor using a massless rope that makes an angle of 30 degrees with the horizontal. when the tension in the rope is 200 N and the kinetic friction coefficient = 0.5, the trunk moves at a constant speed. what is the mass of the trunk?

Answer 1

pulling force=200cos30
lifting force=200sin30

normal force=mg-lifting force

Net force=ma
in the horizontal, then if a=0
pulling force-friction=0
200cos30-.5(mg-200sin30)=0
solve for m