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

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Engineering Mechanics
The resolved part of the resultant of two forces inclined at an angle 'θ' in a given direction is equal to

The difference of the forces multiplied by the cosine of θ
The sum of the resolved parts of the forces in the given direction
The sum of the forces multiplied by the sine of θ
The algebraic sum of the resolved parts of the forces in the given direction

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