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The answer depends on the rate of change of WHAT? The rate of change of the gas used? the rate of change of the gas left, the rate of change of the range that the vehicle will go? The question is too vague.
You can determine if a rate of change is constant, by taking the instantaneous rate of change at multiple points - if they are all equal to each other, it can be assumed that the rate of change is constant. Alternatively, you can differentiate the function (if there is an associated function) - if this comes to a constant i.e. a number, then the rate of change is constant.
Constant rate of change is is counting by 10s or and even number
a car braking is a negative rate of velocity change
no... the sign indicates whether the rate of change is increasing or decreasing. It is only negative if the rate is decreasing over time.