Position and displacement.

 

position: .

Example: .


Displacement : If a particle moves from to then its displacement is .

 

Example: a particle moves from to what is its displacement?

 

.

Question: a particle moves according to

    x = - t2 + 2 t +3,
    y = 0.5 t2 - 2.5 t +2.

Draw its trajectory in the x-y plane.

Answer:

t x y
0 3 2
1 4 0
2 3 -1
3 0 -1
4 -5 0