Question

A man can row a boat with speed v_br in still water, speed of river flow is v_r and v_r is two times of v_br. Man reach one bank to other bank and follow a path so that the path traveled by boat is shortest. Then angle between velocity vector of boat in still water and current flow of water in river is –

• A. $30^{0}$
• B. $60^{0}$
• C. $90^{0}$
• D. $120^{0}$

Answer 1

Answer: (D)

$120^{0}$

Answer 2

For shortest path when v_br < v_r.

sin q = $\frac{v_{br}}{v_{r}}$