I am having troubles with a physics question. I can't figure out what formula to use to solve the following question: Particle A passes a point with an initial velocity of 14.3 m/s and an acceleration of 4.15 m/x^2. Particle B has a 46 m head start at 7.85 m/s with an acceleration of 2.68 m/s^2. At what time will A pass B? Answer in units of s. Any suggestions.