1. The problem statement, all variables and given/known data A car that is accelerating uniformly travels 18 m in the fifth second of its motion. Calculate acceleration. I've tried to answer this a million different ways. If it's in the fifth second on motion that means it has travelled for four seconds, yes? And I'm not sure that this question gives enough variables for it to be answered... would you agree? 2. Relevant equations d=ut+0.5(at^2) 3. The attempt at a solution The answer in my book says 4.0 is correct. I can't seem to get this. d=ut+0.5(at^2) 18=0+0.5(16a) 36=16a 36/16 =2.25 Then i was thinking perhaps it has travelled 18 m in 0.5 seconds only, so i did :d=ut+0.5(at^2) 18=0=0.5(0.25a) 36=0.25 36/0.25 =144 Please help!