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A ship A travels in the north making an angle of 45? to the West with a velocity of 18 km/hr and ship B travels in the East with a velocity of 9 km/hr. Find the relative velocity of B w.r.t. ship A.
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VA=18kmph=5m/s135=5cos135i+5sin135j=3.54i+3.54jm/s

VB=9kmph=2.5m/s=2.5im/s

¯VA/B=ˉVBˉVA=2.5i(3.54i+3.54j)=6i3.54j=7m/s31

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