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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.

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# Homework Help: Car moving down road

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