A weight suspended from a spring is seen to bob up and down over a distance of 25 cm twice each second. what is its frequency? answer in units of hz.

For the frequency it is computed by 2 bobs/second which is equal to 2 Hz. Whereas the period is compute by 1/freq = 1/2 secondAnd lastly, the amplitude is the distance from the equilibrium position tot he maximum displacement so in this case, it is one half the 25 cm peak to peak distance, or 12.5 cm.