Question

Joana Marie is a swimmer. She swims directly across a river flowing at 4 m/s with a velocity of 2 m/s. What will be the actual velocity of Joana Marie relative to the river? Determine its angle.(solution)

Answer 1

$v'=\sqrt{v^2+u^2}=4.5~\frac ms,$

$\theta=\arctan\frac uv=27°.$