Which of the following is an example of a static body?

A static body is defined as one that is not in motion relative to a reference frame and experiences no net forces acting on it. In this context, a rigid body that is at rest typifies a static body since it is stable and does not change its position over time.

This concept is rooted in the principles of mechanics, particularly the equilibrium of forces. When a body is at rest, it implies that all forces acting on that body are balanced, resulting in no acceleration or movement. This condition of rest can be influenced by various factors, including friction, support from other surfaces, and the absence of external forces.

The other options describe states of motion or changes in trajectory, indicating that the bodies involved are not static. For instance, acceleration and deceleration imply that forces are being applied that result in movement, while a body colliding and deflecting demonstrates dynamic interactions with other objects rather than being static.