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Ravi told his friends that his house is 1km towards south from main post office. express the displacement & distance moved by the friend from the post

office, when he arrive at Ravi house mention the ref pt choose you



Ravi's friend moves towards his house from the main post office, i.e. he moves towards South. So, the reference point chosen here is the Main Post Office. 
  To reach Ravi's house, the friend needs to travel 1 km. to the south. Hence :
                              distance travelled = 1 km
                              displacement        = 1 km (towards south of the P.O.)
  NOTE : Direction needs to be specified when describing a vector quantity.
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