A car is tested on a 230 m diameter track. If the car speeds up at a steady 1.2 m/s^2, how long after starting is the magnitude of its centripetal acceleration equal to the tangential acceleration? it seems simple, but i just cant seem to get it!... find: change in time when centripetal acceleration = tangential acceleration. r = 115 m. a = 1.2 m/s^2 (which type of a, i dont know) centripetal accel = v^2/r or w^2/r tangential accel = (radius)(angular accel) i tried setting them equal to each other obviously, but no luck. can someone help me out!?!?