Question

A person aiming to reach the exactly opposite point on the bank of a stream is swimming with a speed of 0.5 m/s at an angle of 120⁰ with the direction of flow of water. The speed of water in the stream is

• A. 1 m/s
• B. 0.5 m/s
• C. 0.25 m/s
• D. 0.433 m/s

Answer 1

Answer: (C)

0.25 m/s

Answer 2

$\sin 30^{o} = \frac{v_{r}}{v_{m}} = \frac{1}{2} \Rightarrow v_{r} = \frac{v_{m}}{2}$=$\frac{0.5}{2} = 0.25m ⥂ / ⥂ s$