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it is w= the square root of k/m

so, the x in (1/2)Kx^2 can be substituted by A => (1/2)KA^2. why?

yea hence you use that formula in amplitude point this point has x=A did you got it?

yes :)

because of at extreme position the displacement of the block will be X=A,

@ igbona,any problem,,