Question

Wind in blowing NE with 18$\sqrt{2}$ km h^-1 and steamer is heading due west with 18 km h^-1. In which direction is the flag on the mast fluttering?

• A. North West
• B. North
• C. South West
• D. South

Answer 1

Answer: (D)

South

Answer 2

$\overrightarrow{V}$_Res = $\overrightarrow{V}$_steamer + $\overrightarrow{V}$_wind = - 5$- 5\widehat{i} + 5\widehat{i} + 5\widehat{j} = 5\widehat{j}$. The flag will flutter in a direction opposite to the direction of motion.