Final answer:
Linear acceleration refers to any change in velocity over time, either through speeding up, slowing down, or changing direction. It does not refer to movement with constant speed or simply covering distance.
Step-by-step explanation:
Linear acceleration is defined as the rate at which velocity changes, which includes both changes in speed and changes in direction. The correct answers that relate to linear acceleration are:
- Change in velocity over time
- Change in direction without changing speed
- Rate of change of velocity
It is not specifically related to a change in position with constant speed or a change in speed over distance, as these do not directly describe a change in velocity. Linear acceleration can occur when an object speeds up, slows down, or changes direction.
For example, when a car speeds up from a red light, it is accelerating. Similarly, when it takes a turn at a constant speed, it also experiences acceleration due to a change in direction, even if the speed remains constant.