Applied Mechanics and Graphic Statics
If a body is lying on a plane whose inclination with the horizontal is less than the angle of friction, then i. a force is required to move the body upwards ii. a force is required to move the body downward iii. the body will not be in equilibrium The correct answer is

both (i) and (iii)
both (i) and (ii)
only (i)
only (ii)

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

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

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