Question

Given $\left|{\overrightarrow{V}}_{br}\right|=4m/s$ =magnitude of velocity of boatman with respect to river, ${\overrightarrow{V}}_r=2m/s$ in the direction perpendicular to velocity of boatman. Boatman wants to reach from point A to point B. At what angle $\theta$ should he row his boat? Assume that B is nearest point to A on the far bank.

Answer 1

For the boat to reach the point B, the boatman rows his boat in a direction making an angle $\theta$.

$\therefore$ $V_{br}cos\theta =V_r$

OR $4cos\theta =2$ $⟹cos\theta =0.5$

Thus $\theta ={60}^o$