Theory of Machine
According to Kennedy's theorem, if three bodies move relatively to each other, their instantaneous centers will lie on a

Triangle
Straight line
Rectangle
Parabolic curve

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Theory of Machine
The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

The Ackerman steering gear is most economical
The Ackerman steering gear consists of turning pairs
Both (A) and (B)
Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels

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