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

An automobile moving along a straight track changes its velocity from 40 m/s to 80 m/s in a distance of 200 m. What is the (constant) acceleration component of the vehicle during this time?

2. Relevant equations

3. The attempt at a solution

I try to solve this problems with 2 different approaches.

First :

Since we don't know the time (t) , we need to calculate the time. If we assume the initial position as x_{i}=0 and V_{xAvg}as 40 m/s , then I am getting t=5 sec. But that doesn't help me to reach the final answer. I ended up with 8.0m/s^{2}.

Second:

If I didn't care about the time(t) and if I use Velocity as a function of position eq ( assuming x_{i}=0 ) then I am getting the correct answer which is 12m/s^{2}.

My question is "Can I assume the initial position is x_{i}=0? IS IT CORRECT?"

Thank you!!

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# Homework Help: Calculating the constant acceleration

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