Theory of Machine
A typewriter mechanism has 7 numbers of binary joints, six links and none of higher pairs. The mechanism is

Soundness would depend upon which link is kept fixed
Not sound
Data is not sufficient to determine same
Kinematically sound

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Theory of Machine
Inertia force acts

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

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