A physics professor is pushed up a ramp inclined upward at 30. 0° above the horizontal as she sits in her desk chair, which slides on frictionless rollers. the combined mass of the professor and chair is 85. 0 kg. she is pushed 2. 50 m along the incline by a group of students who together exert a constant horizontal force of 600 n. the professor’s speed at the bottom of the ramp is 2. 00 m>s. use the work–energy theorem to find her speed at the top of the ramp.