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Acceleration may be constant or variable. Of course, in many high-school level problems, it is assumed to be constant, because in that case, the mathematics is simpler.
Constant velocity has speed always constant along the direction with respect to time. Variable velocity changes its speed with respect to time. Constant velocity has zero acceleration. Variable velocity has non-zero acceleration . An object moving at a constant velocity maintains both the same speed and direction. An object moving at a variable velocity can be changing speed or direction of travel or both.
a variable is the thing that we change during the experiment while control is the thing that we remain it to be constant through the whole experiment.
The Control(Controlled Variable)
The constant is the number; the variable is the letter.
Both speed and acceleration can be variable, depending on the circumstances.
A change in speed is a change in velocity - so, a change in speed is an example of acceleration! Acceleration may be positive or negative. Negative acceleration is sometimes called deceleration. When a force acts on an object; it may change the object's acceleration (speed, direction, or both).
The question is about an oxymoronic expression. A constant cannot be a variable and a variable cannot be a constant!
Constant variable
A constant is not a variable at all, and none of its factors was a variable. It is constant.
A constant is a variable that does not change. The correct term is constant variable.
The opposite of the word "constant" is "variable".