Final answer:
The time period for one cycle of the barn door can be measured in seconds.
Step-by-step explanation:
The time period for one cycle of the barn door can be measured in seconds. The period is the time it takes for one complete cycle of a repetitive motion. In this case, the barn door is oscillating back and forth, so it completes one cycle when it moves from one extreme position to the other and then back again.
To find the time period, you can measure the time it takes for the barn door to complete one cycle. For example, if it takes 5 seconds for the barn door to go from one extreme position to the other and then back to the first position, then the time period is 5 seconds.