A man can swim in still water with a speed of \( 2 \mathrm{~ms}^{-1} \). If he wants to cross a ...

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A man can swim in still water with a speed of \( 2 \mathrm{~ms}^{-1} \). If he wants to cross a river of water current speed \( \sqrt{3} \mathrm{~ms}^{-1} \) along shortest possible path, then in which direction should he swim?
(a) At an angle \( 120^{\circ} \) to the water current
(b) At an angle \( 150^{\circ} \) to the water current
(c) At an angle \( 90^{\circ} \) to the water current
(d) None of these
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