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luvotomy

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A particle, whose displacement is x, moves in simple harmonic motion. find x as a function of t if acceleration= -4x and if x=3 and velocity = -6 root 3 when t=0.

i'm trying to use: x= a sin(nt+alpha)? :hammer:
 

conics2008

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use both the displacemnt and the velocity dx/dt

sub the condition then when you have those two equation you can divide them both to get tan something = soemthing hence you ocan find your alpha.
 

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