A frictionless trolley of mass 50 kg is pulled up a ramp by a rope attached to a winch. The ramp is inclined at 25 degrees to the horizontal, and the winch exerts a constant force of 400 N via the rope, parallel to the ramp. If the trolley starts from rest, calculate the following at the point when the trolley has travelled 10 metres measured up the slope: i) the work done on the trolley. ii) the increase in gravitational potential energy of the trolley. iii) the kinetic energy of the trolley. iv) the speed of the trolley.