Question

what type of interpolation mode creates animations that move at a constant speed?
curve
linear
smooth
step

Explanation:

Linear interpolation creates animations that move at a constant speed. In linear interpolation, the values change at a steady rate between keyframes. Curve interpolation usually has acceleration or deceleration. Smooth interpolation is a more general term that might not specifically imply constant - speed. Step interpolation has sudden jumps rather than a constant - speed movement.

Answer:

Linear