Relative motion in 1 and 2 dimensions

[RadiationX]

can someone explain the concept of relative motion in one and two dimensions?
how do i determine relative motion?

 

[Davorak]

Relative motion is the velocity an object is moving relative to somehting else.

So for one dimension:
If we have object A moveing in the -x direction with a velocity of -5 m/s and object B moving in the +x direction with a velocity 5m/s. If we wanted to know the relative velocity of A from B, it is the same as considering B still and A moving.

To find the answer we subtract B's velocity vector from A's velocity vector.
Avv -Bvv = -5m/s -(5m/s)

Relative velocity of A from B:
Avv -Bvv = -5m/s - 5m/s = -10ms

Relative velocity of B from A
Bvv-Avv = 5m/s -(-5m/s) =5m/s +5m/s) =10m/s

The same can be extended to two dimentions by using two dimensional vectors.

 

[RadiationX]

thanks i got it