Lesson eLearning

A person walks 6 km north and then 3 km south. What is his displacement?

easy 2 marks Class 7 · Science · Motion and Time
Answer
3 km north

The correct answer is 3 km north — State the displacement: 3 km north.

Step-by-step solution

  1. Represent each leg as a vector: 6 km north (+6), 3 km south (-3).
  2. Add the vectors: +6 km + (-3 km) = +3 km.
  3. Resulting displacement is 3 km towards the north.
  4. State the displacement: 3 km north.
Common mistake: Adding absolute distances instead of vector sum

Concept tested: Vector addition for displacement

Published · How this solution was prepared and checked

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