1. The problem statement, all variables and given/known data What distance is required to stop a car going 90km/h if the car can stop with an acceleration of -6.0m/s2? 2. Relevant equations a = v2-v1/t d = (v1+v2/2)t 3. The attempt at a solution I'm thinking first we have to solve for t. Which would be the speed divided by acceleration, which is -0.36 km/h^2 over 80km/h which is 0.0045 hours. Now to solve for distance, it would be 80km/2 x 0.0045 Which leaves me with 0.18 which is completely wrong because the answer is supposed to be 41 m. Help please? Thank you.