Ravi told his friend that his house is $1 \,km$ toward south from the main Post Office. Express displacement and the distance moved by the friend from the Post Office when he arrives at Ravi's house. Mention the reference point chosen by you.

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Let the reference point be the Post Office. Let this be the origin of his motion. Since the motion is along a straight line, therefore, both distance moved and displacement will be same. Thus displacement and distance moved will be $1$ kilometre.

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