hi
we can solve it by this relation which could explain why the time of amplitude is 3 the time of half of the amplitude
x =Asin(wt and if x = 0.5A we could solve this equation mathematically with the aim that w = 2 pi Nu
when Nu is the frequency and then we will get t which is the time of half amplitude = 1 / 3 the time of the amplitude
and then we can easily solve this problem
thanks
bye
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