1. The problem statement, all variables and given/known data A loaded ore car has a mass of 950 kg and rolls on rails with negligible friction. It starts from rest and is pulled up a mine shaft by a cable connected to a winch. The shaft is inclined at 30 degrees above the horiz. The car accelerates uniformly to a speed of 2.2 m/s in 12.0 s and then continues at a constant speed. What max power must hte winch provide? 2. Relevant equations P=W/(delta)t W=(delta)E 3. The attempt at a solution So I found the displacement using kinematics to determine the DISTANCE up the ramp that the cart goes while accelerating. this was 13.176m . Then I found the change in height by trig (6.588 m) And finally , I found the change in energy and divided by time of acceleration. My final answer was 5307 W . But the answer is supposed to be twice this value. Where did we go wrong?