Kinematics Question 326
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 $ 120{}^\circ $ with the direction of flow of water. The speed of water in the streaM is [CBSE PMT 1999]
Options:
A) 1 m/s
B) 0.5 m/s
C) 0.25 m/s
D) 0.433 m/s
Correct Answer: C $ \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 $
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