A train moves due north at a rate of 96933 ms relative to, Ask an Expert

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A train moves due north at a rate of 9.6933 m/s relative to the ground. A passenger on the train throws a ball northeast (angle half-way between due east and due north). If the passenger throws the ball at 1 m/s, what is the magnitude of the ball's speed as measured by an observer on the ground.

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