1. The problem statement, all variables and given/known data A race car going around a flat, unbanked circular track gradually increases speed as it completes one full trip around the track. Which of the following can explain why the car gains speed? (A) Energy stored in the fuel is converted to mechanical energy. (B) A component of the frictional force exerted by the ground on the tires is directed toward the center of the circle. (C) A component of the frictional force exerted by the ground on the tires is in the direction of motion. (D) The car’s velocity and acceleration are perpendicular. 2. Relevant equations (This is multiple correct so multiple answers may be correct) Just common sense 3. The attempt at a solution So A is very obvious, but I'm not sure what else is correct because A is not the only one that's correct.