Hence, Ball suspended from string is periodic function
What is a Periodic Function?
When the function return to it's original value after particular intervals are called period function.
How to check?
statement 1 is flag on windmill which is constant function so it is not periodic.
statement2 is height of baseball after being hit ,this function is changing as it will provide different values , so is again non periodic.
Statement 3 - ball suspended from string , as ball is attached to string so it returns back in constant interval , so it is periodic function.
Hence, Ball suspended from string is periodic function.
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