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Acceleration

The driver of...

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The driver of a train A moving at a speed of 30 ms^{-1} sights another train B moving on the same track towards his train at a speed of 10 ms^{-1}. He immediately applies brakes and achives a uniform retardation of 4 ms^{-2} .To avoid head-on collision, what must be minimum dis†an ce between the trains?

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The driver of train A moving at a constant speed of $30 m / s$ sees another train B moving on the track at a speed of $10 m / s$ in the same direction. He immediately applies break and achieves a uniform retardation of 3m/s². To avoid collision, what must be the minimum distance between the trains?

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