Question

A person moves 30 m north, from there 20m east and finally $30\sqrt{2}$ m south-west from there His displacement from initial position is.

• A. 10 m west
• B. 10 m east
• C. 5 m west
• D. 5 m east

Answer 1

Answer: (A)

10 m west

Answer 2

$\bar{S} = 30 \hat{j} + 20 \hat{i} + 30( - \hat{i} - \hat{j})$ $\Rightarrow \, \bar{S} = - 10 \hat{j} \, \Rightarrow 10 m \, west$