Considering coordinate system where east is directed towards x axis, then
Net displacement = 10i - 6i + 8j - 5j
= 4i + 3j
Magnitude of net displacement:
=42+32=\sqrt{4^2+3^2}=42+32
=25=\sqrt{25}=25
= 5 km
Direction:
=45i+35j=\frac{4}{5}i+\frac{3}{5}j=54i+53j
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