Q) Atractor of mass 500 kg pulls a trailer of mass 200 Kg up a rough slope inclined at 17 degrees to the horizontal. The resistance to the motion is 4N per kg. Calculate the work done by the tractor engine, given that the vehicle travels at a constant speed of 1.4m/s for 2 minutes.
what iโve done so far is calculate the distance travelled, s=(1.4)(120)=168 m
then resolve the weight(in the direction of motion), 7000sin17
then i calculated the resistance to motion, 4x700=2800
then according to the work energy theorem, W(tractor)-7000sin17 (168) -2800 (168)=0
but i just donโt seem to be getting the answer. Where have i gone wrong?