I asked this question before, but I don't quite understand it.
So the question is
A particle undergoes simple harmonic motion. Initially its displacement is 1 , velocity 1
and acceleration is -12. and find out displacement and acceleration when the velocity is
square root of 8.
Someone says that harmonic equation takes the form y(t)=Acos(Wt+@)
But, I can not solve this equation by taking derivative and putting in the values//
Someone help me plz