physic

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?

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  1. 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°)

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