Question

A person moves 50m in northern direction, 40 m in east and after that 20m in southern direction. The magnitude of net displacement of the person will be,

• A. 50 m
• B. 60 m
• C. 70 m
• D. 80 m

Answer 1

The correct option is A

50 m

$\overrightarrow{S}$ = ${\overrightarrow{S}}_1$ + ${\overrightarrow{S}}_2$ + ${\overrightarrow{S}}_3$

Taking X axis along East and Y axis along North, we get,${\overrightarrow{S}}_1=50\hat{j},{\overrightarrow{S}}_2=40\hat{i},{\overrightarrow{S}}_3=(-20)\hat{j}{\overrightarrow{S}}_{net}=40\hat{i}+30\hat{j}$