On a velocity-time graph, what does a horizontal straight line above the time axis indicate about the motion of the object?
Constant velocity
On a velocity-time graph, the height of the line gives the velocity and the slope gives the acceleration.
A horizontal line means the velocity has the same value at every instant, so the slope, and hence the acceleration, is zero.
Because the line lies above the time axis, the velocity stays positive, so the object keeps moving in the same direction with uniform velocity. Constant acceleration would appear as a sloping straight line.
Hence, the answer is constant velocity.
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