Final answer:
The pendulum at its highest point is an example where velocity is zero but acceleration is not, due to gravity causing constant acceleration.
Step-by-step explanation:
The example in which velocity is zero yet acceleration is not is pendulum at its highest point. Although the pendulum momentarily stops at its highest point and therefore has a velocity of zero, it is still subject to gravity which acts as a constant acceleration pulling it back down. This scenario elegantly illustrates that even when an object's velocity is momentarily zero, if it's under the influence of an unbalanced force, it must have acceleration.
For clarity, in a projectile motion scenario, the velocity of an object is zero at the peak of its trajectory (if we consider vertical velocity alone). Despite this, the acceleration due to gravity remains constant at approximately 9.81 m/s2 downward. This consistent gravitational pull ensures that, although the projectile's vertical velocity is zero at its highest point, it still has a downward acceleration.