please answer the following

4. (4pts) A physics professor is pushed up a ramp inclined upward at 40 above the horizontal as he sits in his desk chair that slides on frictionless rollers. The combined mass of the professor and chair is 85.0 kg. He is pushed 2.50 m along the incline by a group of students who together exert a constant horizontal non-conservative force of 600 N. The professor's speed at the bottom of the ramp is 2.00 m/s. incline A. (1pt) What is the work done by the non-conservative force along the include? B. (1pt) What is the gravitational potential energy gained by the professor and his chair? C. (1pt) What is the kinetic energy at the bottom of the ramp? D. (1pt) Use the work-energy theorem to find his speed at the top of the ramp