A standing man observes rain falling with velocity of \( 20 \mathrm{~m} / \mathrm{s} \) at an an...

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A standing man observes rain falling with velocity of \( 20 \mathrm{~m} / \mathrm{s} \) at an angle of \( 30^{\circ} \) with the vertical. Find the
P
velocity with which the man should move so that rain
W
appears to fall vertically to him.
(1) \( 10 \mathrm{~m} / \mathrm{s} \)
(2) \( 20 \mathrm{~m} / \mathrm{s} \)
(3) \( 30 \mathrm{~m} / \mathrm{s} \)
(4) \( 10 \sqrt{2} \mathrm{~m} / \mathrm{s} \)
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