[填空题]
Starting from rest in the pit g2 trsq/-/0uqo uqrski:zy7, area, a race car accelerates at a unifouw3 oiq2y*q j) yq :,:1xydkhyrm rate to a speed of 45 m/s inq:yd ) y 3q*xw2,jiuo1kyy:q h 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. $m/s^2$
