Question

A ship sails west for 100km and then south for 100km. What is the displacement?

Answer 1

$\sf \vec{w}=100$

• $\sf \vec{s}=100$

For displacement apply Pythagorean theorem

$\\ \rm\hookrightarrow 100^2+100^2$

$\\ \rm\hookrightarrow 10000+10000$

$\\ \rm\hookrightarrow 20000$