Applied Mechanics and Graphic Statics
On a ladder resting on a rough ground and leaning against a smooth vertical wall, the force of friction acts

Downwards at its upper end
Zero at its upper end
Upwards at its upper end
Perpendicular to the wall at its upper end

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Applied Mechanics and Graphic Statics
Pick up the incorrect statement from the following. In a simple harmonic motion

Velocity is minimum at the end of the stroke
Acceleration is zero at the mean position
Velocity is maximum at its mean position
Acceleration is minimum at the end of the stroke

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