posted by kamran .
A boy moves 100m towards North then 70 my towards East then what is its displacement
Is there a formula for displacement?
Displacement is position vector
in this case it is
70 i + 100 j in x y coordinates where i is unit x and j is unit y vectors
its magnitude is sqrt (70^2 + 100^2)
it direction north of east is
tan theta = 100/70
the compass angle east of north is 90 -theta