Abiker going around a circular track at constant speed is accelerating. why? a. direction is constantly changingb. gravity is pulling on itc. the speed us changingd. the earth is rotating

For acceleration, there needs to be three factors that come into play. Either the change in velocity is increasing, decreasing, or it is changing direction. On a circular track, the direction is always changing. Which fits one of the three factors. So your answer would be A.