car moving down road.... 1. The problem statement, all variables and given/known data A car is moving down a road at 45 km/hr when it runs out of gas. How far does the car move if it takes 6.0s to roll to a stop? 2. Relevant equations x=(vi+vf)/2 *t I tried this equation, but I got the answer of 135 m. It says the answer is 37.5 m in the answers given by the teacher. 3. The attempt at a solution I set it up this way: vi: 45 km/hr vf: 0 t= 6.0 s x=? x= (45+0)/2 * 6.0 = 135 m I want to know what I'm doing wrong, am I using the wrong equation? Thanks.