Question

Betty walks 2km due west then 2km due south calculate the displacement

Answer 1

$s_w= 2km$

$s_s= 2km$

$\vec{W}\perp \vec S$

$s= \sqrt{s_w^2+s_s^2}=\sqrt{2^2+2^2}\approx2.83km$

$\text{Answer: }2.83km$