* Period is the time it takes for one complete vibration (or cycle).

* Frequency is the number of vibrations per second.

Calculations:

1. Frequency: The object completes 100 vibrations in 5 seconds, so its frequency is 100 vibrations / 5 seconds = 20 vibrations per second (or 20 Hz).

2. Period: The period is the inverse of the frequency: Period = 1 / Frequency = 1 / 20 Hz = 0.05 seconds.

Therefore, the object has a period of 0.05 seconds.