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One motor launch A is exactly 1 km nort...

One motor launch A is exactly 1 km north of another launch B. Both launches start from rest , at the same time, with an acceleration of `10 cm*s^(-2)`. The launch A proceeds towards east and B towards north. Find the distance of closest approach between them and the time taken to reach that distance.

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The correct Answer is:
0.707 km ,1 min 40 s
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