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yes. that is right.
please can you tell me about the letter a .

that is fmax=20.56*15.5.
what is the question in letter a?

oh my bad Its this : The angular frequency.

find the angular frequence* which i found with the t=1/f

Sorry i'm confused now.

I found my W using the fact that frequency is T ( period) = 1/f and therefore T=2pi/w

it is OK. Now I urderstood.
k=w^2*m

in letter b you got the correct
answer

so f=kx therefore my amplitude is 31/2 so f = 20.56 *.240 no?

no f=15.5*20.56

yeah sorry and it g ives 319 but it says its wrong, I don't know what to do to change it