If an object has a constant velocity, it means that its speed and direction remain unchanged over time. However, a constant velocity does not necessarily imply uniform acceleration. Here are a few examples of constant velocity but not uniform acceleration scenarios:
Circular motion: An object moving in a perfect circle at a constant speed has a constant velocity because its speed and direction remain the same. However, its acceleration is not uniform because the object is constantly changing its direction, experiencing a centripetal acceleration towards the center of the circle.
Projectile motion: In projectile motion, an object is launched into the air and follows a curved trajectory under the influence of gravity. When the object reaches its highest point, its vertical velocity becomes zero, but the horizontal component of its velocity remains constant (assuming no air resistance). This means that the object has a constant velocity in the horizontal direction, but its acceleration in the vertical direction is not uniform due to the gravitational force acting on it.
Orbital motion: Objects in orbit around a celestial body, such as satellites around the Earth or planets around the Sun, have a constant velocity because their speed and direction are maintained. However, their acceleration is not uniform since they are constantly changing direction due to the gravitational pull of the central body.
In these examples, the objects have a constant velocity because their speed and direction do not change, but their acceleration is not uniform due to the changing direction of motion or the influence of external forces like gravity.