The total displacement is 8 km.
The people traveling west came from the east
They don't - you're traveling west to east.
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westerly
find the resultant of the following displacement a=20km 30south of east
The displacement of the person pacing back and forth travels 5 west 7m west is usually East.
if you are traveling north, the direction to the right would be east. north west east south
The final displacement would be 3 km east of the starting point.
West
It seems that I get about 3 miles more per gallon traveling west to east, than the transverse. Any facts to verify? No, this is simply a myth. There is no difference at all unless you happen to be going up a hill when traveling east.
west to east
You don't gain a day by traveling West, only by traveling East. You lose a day going West.