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Acceleration

The driver of...

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The driver of train A moving at a speed of 30 ms^{-1} sights another train B moving on the same track at a speed of 10 ms^{-1} in the same direction. He immediately applies bracks and achieves a uniform retardation of 2 ms^{`-1}. To avoid collision, what must be the minimum dis†an ce between trains A and B when the driver of A sights B?

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