A 4.4810 3 kg train is stopped at a station. The train must go around a 181

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Question:

A 4.4810³ kg train is stopped at a station. The train must go around a 181 m diameter corner right after it leaves the station. As the train leaves the station it provides a constant forward force of 1.9910³ N. What is the train's acceleration after 16.0 s?