Theory of Machine
The velocity of a particle moving with simple harmonic motion, at any instant is given by (where ω = Displacement of the particle from mean position)

ω² √(x² - r²)
ω √(r² - x²)
ω² √(r² - x²)
ω √(x² - r²)

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Theory of Machine
Inertia force acts

None of the listed here
Along the direction of acceleration force
Perpendicular to the acceleration force
Opposite to the direction of acceleration force

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