Applied Mechanics and Graphic Statics
If a set of given forces are such that their free vectors build a closed polygon, then

The resultant force is zero but resultant couple is not zero
The resultant force and resultant couple both may not be zero
The resultant force and resultant couple are always zero
The resultant force is zero but resultant couple may not be zero

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

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

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Applied Mechanics and Graphic Statics
One end of an elastic string of natural length / and modulus X is kept fixed while to the other end is attached a particle of mass m which is hanging freely under gravity. The particle is pulled down vertically through a distance x, held at rest and then released. The motion is

a simple harmonic motion
a rectilinear motion with constant speed
a damped oscillatory motion
None of these

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Applied Mechanics and Graphic Statics
According to Law of Triangle of Forces

Three forces acting along the sides of a triangle are always in equilibrium
If three forces acting on a, point can be represented in magnitude and direction, by the sides of a triangle taken in order, these will be in equilibrium
If the forces acting on a particle be represented in magnitude and direction by the two sides of a triangle taken in order, their resultant will be represented in magnitude and direction by the third
Three forces acting at a point, can be rep-resented by the sides of a triangle, each side being in proportion to the force

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Applied Mechanics and Graphic Statics
Newton's law of Collision of elastic bodies states that when two moving bodies collide each other, their velocity of separation

Is equal to the sum of their velocities of approach
Is directly proportional to their velocity of approach
Bears a constant ratio to their velocity of approach
Is inversely proportional to their velocity of approach

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