Engineering Mechanics
The centre of gravity of a uniform lamina lies at

The centre of heavy portion
The midpoint of its axis
All of these
The bottom surface

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Engineering Mechanics
According to Newton's first law of motion,

None of these
Everybody continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts
To every action, there is always an equal and opposite reaction

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