A man walk 3km East and then 4km North what is his resultant displacement? Suppose he walk 3km and 4km 60(degree) North of East. What is the displacement?

4 answers

draw a diagram.
(a) Ever hear of a 3-4-5 right triangle?

(b) for this one, use the law of cosines to find the distance d:

d^2 = 3^2 + 4^2 - 2*3*4*cos(120°)

5km

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