A) 10 m along north
B) 10 m along south
C) 10 m along west
D) Zero
Correct Answer: C
Solution :
From figure, \[\overline{OA}=0\overset\frown{i}+30\overset\frown{j},\] \[\overrightarrow{AB}=20\overset\frown{i}+0\overset\frown{j},\] \[\overline{BC}=-30\sqrt{2}\cos 45{}^\circ \overset\frown{i}-30\sqrt{2}\sin 45{}^\circ \overset\frown{j}\] \[=-30\overset\frown{i}-30\overset\frown{j}\] \[\therefore \text{Net desplacement,}\] \[\begin{align} & \text{OC=OA+AB+BC=}-10\overset\frown{i}+0\overset\frown{j} \\ & \text{ }\!\!|\!\!\text{ OC }\!\!|\!\!\text{ =10m} \\ \end{align}\]You need to login to perform this action.
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