(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A truck travels at a constant speed of 28.0 m/s in the fast lane of a two-lane highway. It approaches a stationary car stopped a the side of the road. When the truck is still 125 m behind the car, the car pulls out into the slow lane with an acceleration of 2.6 m/s2. How long will it take the truck to reach the car? (Answer is 6.32 s)

2. Relevant equations

d_{t}= d_{c}+ 125

d_{c}= 1.3t^{2}

3. The attempt at a solution

Okay I got the answer, but it's in quadratic form so:

1.3t^{2}- 28.0t + 125 =

t = 15.2 s or t = 6.32 s

How do you know which answer is the correct one?

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# Homework Help: Motion problem for constant acceleration of truck

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