Working out velocity of particle moving in SHM

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Bolter
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Homework Statement
Calculate the velocity of a particle moving in SHM at a point
Relevant Equations
a = –w^2x
Screenshot 2020-02-25 at 17.46.51.png


So the way I have gone about it is to assume that the equilibrium position is half way between the 2 end points, hence the amplitude of this motion is 9.3/2 = 4.65 cm

Therefore the displacement of the particle when it is 2cm away from one end point should be the distance between that point and the equilibrium position. So i.e. 4.65 – 2 = 2.65 cm

Knowing those 2 values I have done this

IMG_3990.JPG


Is a speed of 0.16 m/s be what you should get?

Thanks for any help!
 
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