[填空题]
Starting from rest in the pit area, a race car accelerates at a unifodqsx; k*.mx3miyg 7.bc)1 f( nzdxl(lrm ra85zrybh;,x a1ip f f.pte to a speed o5abf pi,1px 8. y;rzhff 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. $m/s^2$
