Which of the following best exemplifies inertia in everyday life?

Inertia is a fundamental concept in physics that refers to an object's resistance to changes in its state of motion. This means that an object at rest will remain at rest unless acted upon by an external force.

A parked car remaining still is a prime example of inertia in everyday life. It perfectly illustrates the principle that an object that is not in motion tends to stay that way unless something causes it to move. Here, the car exhibits inertia by not changing its position; it requires an external force, such as a person getting in the car and accelerating, to overcome this state of rest and set it into motion.

Other options, such as a ball rolling down a hill or a bicycle coming to a gradual stop, focus on motion and how inertia interacts with forces acting on those objects. However, they do not highlight the concept of inertia as clearly as a parked car, which embodies the idea of a body at rest persisting in that state. A person walking on a flat surface also demonstrates motion overcoming inertia, but it doesn't emphasize the resistance to change that the parked car does, making the static scenario the most illustrative of inertia.