A person moves $30\, m$ north and then $20\, m$ towards east and finally $30\sqrt 2 \,m$ in south-west direction. The displacement of the person from the origin will be
- A$10\, m$ along north
- B$10 \,m $ along south
- C$10\, m$ along west
- D$Zero$
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- [AIIMS 1998]
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- [JEE MAIN 2020]