Engineering Mechanics
The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by (where, r = Amplitude of motion, and y = Displacement of the particle from mean position.)

ω.√(r² - y²)
ω².√(y² - r²)
ω².√(r² - y²)
ω.√(y² - r²)

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Engineering Mechanics
The term 'Centroid' is

The same as centre of gravity
None of the listed here
The point of suspension
The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis

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