Answer: 0.22hz
Step-by-step explanation:
Hi to answer this question we have to analyze the information given:
So, to calculate the frequency of the pendulum we have to apply the formula;
Frequency (f)= 1 / period
Replacing with the value given:
f = 1/ 4.5 sec = 0.22 hz
Feel free to ask for more if needed or if you did not understand something.