Q. A man goes $10\ m$ towards North, then $20\ m$ towards east then displacement is
A) $22.5m$
B) $25m$
C) $25.5m$
D) $30m$
Explanation
(a) $\overrightarrow{r} = 20\widehat{i} + 10\widehat{j}\ \therefore r = \sqrt{20^{2} + 10^{2}} = 22.5\ m$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.