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