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Two men are running on a straight north ...

Two men are running on a straight north -south track. The person A moves north with a speed of `5 m *s^(-1) ` while B moves south with a speed of `2 m *s^(-1)`. Determint the velocity ( magnitude only) of
(i) A with respect to B .
(ii) the ground with respect to A .
(iii) B with respect to A .

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The correct Answer is:
7,5,7
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