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The straight horizontal line on a graph is referred to as the x-axis. The vertical line on a graph is the y-axis.
That the force that causes the acceleration is not constant.
The line would indicate motion at a constant speed.
The straight horizontal line on the graph says: "Whatever time you look at, the speed is always the same". This is the graph of an object moving with constant speed.
constant speed
The given speed is constant for the given period
Constant speed ... zero acceleration.
It means that as time goes on, the distance increases quickly.
The answer depends on what you mean by "A".
A line. The derivative of a function is its slope. If the slope is a constant then the graph is a line.
a graph that does not have a straight line
A straight line on a distance - time graph represents a "constant velocity".