Circularity system........…….......
Answer is A) Fulcrum
The fixed point that a lever rotates around is called the fulcrum.
Answer:
The second vector 
points due West with a magnitude of 600N
Explanation:
The original vector 
points with a magnitude of 200N due east, the Resultant vector 
points due west (that's how east/west direction can be interpreted, from east to west) with a magnitude of 400N. If we choose East as the positive direction and West as the negative one, we can write the following vectorial equation:
With the negative sign signifying that the vector points west.
that is an example of negative acceleration because it is slowing down
