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A car travelling at a speed of 30 ms^(-1...

A car travelling at a speed of `30 ms^(-1)` due north along the highway makes a left turn on to a sied road which heads towards due west. It takes `40 s` for the car to complere the turn. At the end of `40 s`, the caar has a speed of `20 ms^(-1)` along the side road. Derermime the magnitude of average acceleration over the `40 second` interval.

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