Question

Giving a mass of 2kg

Attached to an elastic and whired round 2times, radius 3cm and for 3sec

Answer 1

I assume the task is to find the frequency of the motion. By definition, the frequency is the number of revolution in one second. Since the mass revolve 2 times in 3 sec, than in one second it revolvs:

$$f = \dfrac{2\space times}{3s} \approx 0.67 Hz$$

Answer. 0.67 Hz.