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

Downwards at its upper end
Away from the wall at its upper end
Towards the wall at its upper end
Upwards 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

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

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