The driver of a car that has a mass of 1400 kg is coasting down a hill. He sees a stop sign at the bottom of the hill. His speed when he begins to brake is 28 m/s and he is 200 m from the stop sign up the hill which has a grade of 10%. How much energy, in the form of heat, must his brakes dissipate to bring him to a full stop? Neglect wind and other frictional resistance.

When can a theory be modified if a new type of technology allows for new observations that raise new questions? a-immediately, while the questions about the theory are being asked b-after new hypotheses related to the theory are tested in experiments c-only after the new observations disprove all parts of the theory d-while scientists begin to think about how the theory could improve