Theory of Machine
When a point moves along a straight line, its acceleration will have

Radial and tangential components both
Coriolis component only
Tangential component only
Radial component only

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Theory of Machine
The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to

Any one of these
One lower pair and two additional links
Two lower pairs and one additional link
Two lower pairs and two additional links

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