A person moves 50m in northern direction, 40 m in east and after that 20m in southern direction. The magnitude of net displacement of the person will be,
50 m
→S = →S1 + →S2 + →S3
Taking X axis along East and Y axis along North, we get,→S1=50 ^j,→S2=40^i,→S3=(−20)^j→Snet=40^i+30^j