Final answer:
If 30 kJ of heat is generated by friction between point A and point B, then the kinetic energy of the car at point B would be 30 kJ less than its initial kinetic energy at point A.
Step-by-step explanation:
The heat generated by friction between point A and point B is 30 kJ. This heat energy is converted from the kinetic energy of the car. To determine the kinetic energy of the car at point B, we need to consider the conservation of energy.
1. Start with the principle of conservation of energy: Energy cannot be created or destroyed, only transferred or transformed from one form to another.
2. At point A, the car has a certain amount of kinetic energy.
3. As the car moves from point A to point B, some of its kinetic energy is converted into heat energy due to friction.
4. The heat generated by friction between point A and point B is 30 kJ, which means the car loses 30 kJ of kinetic energy.
5. Therefore, at point B, the kinetic energy of the car would be reduced by 30 kJ compared to its initial kinetic energy at point A.
In summary, if 30 kJ of heat is generated by friction between point A and point B, then the kinetic energy of the car at point B would be 30 kJ less than its initial kinetic energy at point A.