Answer:
v = 18.84 m/s
Explanation:
Given that,
The length of the string, r = 1.5 m (it will act as radius)
The rubber stopper makes 120 complete circles every minute.
Since, 1 minute = 60 seconds
It means, its frequency is 2 circles every second.
Let we need to find the average speed of the rubber stopper. It can be calculated as follows :
[tex]v=\dfrac{d}{T}[/tex]
d is distance, [tex]d=2\pi r[/tex] and 1/T = f (frequency)
[tex]v=2\pi rf\\\\=2\pi \times 1.5\times 2\\\\=18.84\ m/s[/tex]
So, the average speed of the rubber stopper is 18.84 m/s.
