Question

A small mass attached to a spring oscillates with simple harmonic motion with amplitude of 70 mm, taking 13 seconds to make 40 complete oscillation. Calculate its angular frequency?
You don't need the amplitude to compute the frequency. The fact that it is a mass and spring is also not needed.

The frequency is 40/13 = 3.08 oscillations per second or "Hz".
Multiply that by 2 pi and you get 19.3 radians/s for the angular frequency.

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