On a two-ane road, car A is travelling w...

On a two-ane road, car A is travelling with a speed of `36 km h ^(-1).` Two cars B and C approach car A in opposite directions with a speed of `54 km h ^(-1)` each. At a certain instant, when the distance AB is equal to AC, both being 1 km, B decides to overtake A before C does. What minmum acceleration of car B is required to avoid an accident ?

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`1 ms^(-2)`

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