A physics professor is pushed up a ramp inclined upward at an angle 25. 0 degrees above the horizontal as he sits in his desk chair that slides on frictionless rollers. The combined mass of the professor and chair is 88. 0 kg. He is pushed a distance 2. 40 m along the incline by a group of students who together exert a constant horizontal force of 610 N. The professor's speed at the bottom of the ramp is 1. 60 m/s.