Answer:disequilibrium
Explanation:
When the net force is not zero it is called disequilibrium
Given parameters:
First velocity = 2.50m/s
Time of travel = 3s
Second velocity = 1.50m/s
Unknown:
The displacement during the first interval = ?
Velocity is the displacement of a body with time. Displacement is a distance move in a specific direction by a body.
Velocity = 
So;
Displacement = Velocity x Time taken
Now input the parameter for the first velocity and time of travel;
Displacement = 2.5 x 3 = 7.5m
The displacement id 7.5m
Explanation:
2) C would need the least effort, because the longer the effort distance, the least the effort applied.
Answer:
A controlled variable does not change during a experiment
Explanation:
it's c