[填空题]
Starting from rest in tvu/hct 106(6wc8cckxr c2bi q he pyokae ihj9b 5q 3j-i11it area, a race car accelerates at a uniform rate to a speed o9ijkyha1ioj-1q3 b5 e f 45 m/s in 15 s, moving on a circular track of radius 500 m. (only fill in numerical value in the blanks)
(a) Calculate the tangential acceleration. $m/s^2$
(b) Calculate the radial acceleration when the instantaneous speed is equal to 30 m/s. $m/s^2$
