Observe the movement of various bodies. Which of them change their speed all the time while moving, and which

Observe the movement of various bodies. Which of them change their speed all the time while moving, and which move almost uniformly over a long period of time?

They change speed all the time when moving: a ball thrown at an angle to the horizon, a skier moving along a serpentine.
They move almost evenly: a pedestrian, a car on the highway, birds in the sky.

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