1. The problem statement, all variables and given/known data An accelerating lab cart passes through two photo gate timers 3.0 m apart in 4.2 s. The velocity of the cart at the second timer is 1.2 m/s (4 marks) a.) What is the cart’s velocity at the first gate? b.) What is the acceleration? 2. Relevant equations v = vi + at Vaverage = d/t d = vi(t) + 0.5 at^2 Vf^2 = Vi^2 + 2ad 3. The attempt at a solution d = 3m t = 4.2 seconds vf = 1.2 m/s vi = ? a = ? I have tried all of those formulas and they have at least 2 unknowns afterwards. The question is worth 4 marks so velocity initial can't be 0.