Wind is blowing in the north direction at speed of \( 2 \mathrm{~m} / \mathrm{s} \) which causes...

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Wind is blowing in the north direction at speed of \( 2 \mathrm{~m} / \mathrm{s} \) which causes the rain to fall at some angle with the vertical. With what velocity should a cyclist drive so that the rain appears vertical to him :
(A) \( 2 \mathrm{~m} / \mathrm{s} \) south
(B*) \( 2 \mathrm{~m} / \mathrm{s} \) north
(C) \( 4 \mathrm{~m} / \mathrm{s} \) west
(D) \( 4 \mathrm{~m} / \mathrm{s} \) south
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