Respuesta :

Let the four directions are along X and Y axis

North = +Y aixs

South = - Y axis

East = + X axis

West = - X axis

So displacements are given as

[tex]d_1 = 4km[/tex] South

[tex]d_2 = 2km[/tex] North

[tex]d_3 = 5km[/tex] South

[tex]d_4 = 5km[/tex] North

Now total displacement towards north is 5km + 2 km = 7 km

Now total displacement towards south is 5km + 4 km = 9 km

Now the net displacement of whole journey will be

d = 9 - 7 = 2 km towards SOUTH