Final answer:
Yes, the acceleration can be zero in certain circumstances such as uniform circular motion, projectile motion at the highest point, and when an object is at rest or moving with a constant velocity.
Step-by-step explanation:
The acceleration of an object can be zero in certain circumstances. In uniform circular motion, for example, an object is constantly changing its direction, but its speed remains constant. This means that although the object is changing its velocity, its acceleration is directed towards the center of the circle and has a magnitude of zero.
In projectile motion on level ground, assuming negligible air resistance, the acceleration is only zero at the highest point of the trajectory. This is because at that point, the object momentarily stops moving upwards and starts moving downwards. The acceleration is zero because there is no change in the object's velocity during that instant.
Another example is when an object is at rest or moving with a constant velocity. In these cases, the acceleration is zero because there is no change in the object's velocity over time.