In first case, displacement is 5 km ( by Pythagoras theorem).
In second case, cosine rule
x^2 = 3^2 + 4^2 - 2*3*4*cos120
x^2 = 25 + 12
x = √37
A man walk 3km East and 4km North what is his resultant displacement? Suppose he walks 3km and 4km 60 degree North of East. What is the displacement?
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