Engineering Mechanics
A ladder is resting on a rough ground and leaning against a smooth vertical wall. The force of friction will act

Upward at its upper end
Zero at its upper end
Downward at its upper end
Perpendicular to the wall at its upper end

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

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
Everybody continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force
None of these
To every action, there is always an equal and opposite reaction

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