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)

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

ANSWER DOWNLOAD EXAMIANS APP

Theory of Machine
Higher pairs are those which have

Surface contact between the two elements when in motion
Two elements that permit relative motion
Point or line contact between the two elements when in motion
Elements of pairs not held together mechanically

ANSWER DOWNLOAD EXAMIANS APP