1. The problem statement, all variables and given/known data "A car is approaching traffic lights. The car is travelling with speed 10ms-1. The driver applies the brakes to the car and the car comes to rest with constant deceleration in 16s. Modelling the car as a particle, find the deceleration of the car." 2. Relevant equations v = u + at 3. The attempt at a solution [STRIKE]s =[/STRIKE], u = 10ms-1, v = 0ms-1, a = ?, t = 16s v = u + at 0 = 10 + 16a a = -10 ÷ 16 a = -0.625ms-2 The answer given is 0.625ms-2. Why is the answer positive and not negative?