Question

a person moves 30m north and then 20m towards east and finally 30root2m in southwest direction the displacement of yhe person from the origin will be?

Answer 1

To understand such tricky questions, it is imperative that they be given a diagrammatic representation.

If you take a line 30m north and then 20m east to join it 30root2m in south west, you will observe that the diagram looks more or less like a right angled triangle.

 To calculate the displacement of the person calculating it by d = final position-initial position

=30 √2 m in south - west - 10 √13 in south west

                       =42.43 m -36.05 m

                       =6.38 m