Answer to Question #14872 in Mechanics | Relativity for DB dhola

Question #14872
which of the following pair can have zero displacement?
a) 4,6,8,15 km
b) 10,30,50,120 km
c) 5,10,30,50 km
d) 40,50,75,200 km
ans is a) but why ? i don't know. please give me solution.
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