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Question: An aeroplane flies 400 m north and 300 m south and then flies 1200 m upwards then net displacement i...

An aeroplane flies 400 m north and 300 m south and then flies 1200 m upwards then net displacement is

A

1200 m

B

1300 m

C

1400 m

D

1500 m

Answer

1200 m

Explanation

Solution

An aeroplane flies 400 m north and 300 m south so the net displacement is 100 m towards north. Then it flies 1200 m upward so r=(100)2+(1200)2r = \sqrt{(100)^{2} + (1200)^{2}}

=1204m−~1200m= 1204m\widetilde{-}1200m

The option should be 1204 m, because this value mislead one into thinking that net displacement is in upward direction only.