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## Homework Statement

A car starts from rest on a curve with a radius of 190m and accelerates at 0.800 m/s^2 . How many revolutions will the car have gone through when the magnitude of its total acceleration is 2.60 m/s^2 ?

## Homework Equations

## The Attempt at a Solution

I have tired the magnitude of acceleration = sqrt ((at^2/r^2) +a^2)

so then I said 2.6 =.8t^2/190^2 + .8^2 So I got 297 seconds for the time.

Then I plugged time into x=1/2at^2 but this is where I am not sure. Which acceleration should I be plugging into that equation. I have tried a=2.6 a=.8 and a=a/r =.004 and none of those are giving me a correct answer.

I have been dividing my answer by 2pi to get the answer in revolutions but the stupid online thing keeps saying try again and I am not sure what I am doing wrong. I appreciate any help! Thanks!

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