Dallas says that any change in velocity is directly proportional tothe time interval over which the change took place. Dana says
thatis true only when the acceleration is constant. Which one, ifeither, is correct? a. Dana,because it is true then the acceleration is constant
b. Dallas,because we can define ax, avg so thatDvx= ax, avgt.
c. Dallas,because ax, avg always is equalto
d. Allthe above are correct.
e. Only(a) and (b) above are correct
A factor that remains the same no matter the situation is called an independent variable. The variable that changes is called the dependent variable and will depend on what the independent variable is.