When an object is at rest, it means that its velocity is zero. Velocity is a vector quantity that includes both magnitude (speed) and direction. So, if an object is at rest, its speed is zero.
On the other hand, if an object is moving with a constant velocity, it means that its speed remains constant over time, and its direction does not change. In this case, the speed of the object would be a non-zero value, but the magnitude of the velocity remains constant.
To summarize:
- Rest: Speed = 0, Velocity = 0 (zero magnitude and zero direction)
- Constant Velocity: Speed ≠ 0 (non-zero), Velocity remains constant in magnitude and direction.