A person moves 30 m north, then 30 m east, then 302 south-west. His displacement from the orginal position is

Resolving displacement 302 south-west into two rectangular components, we getDisplacement = 302 cos450 = 302 ×(12) = 30 m∴Effective displacement due to 30 m north and 30 m south is zero.Also effective displacement due to 30 m east and 30 m west is zero.