Applied Mechanics and Graphic Statics
Two balls of masses 3 kg and 6 kg are moving with velocities of 4 m/sec and 1 m/sec respectively, towards each other along the line of their centers. After impact the 3 kg ball comes to rest. This can happen only if the coefficient of restitution between the balls is

3/5
1/5
2/3
1/3

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Applied Mechanics and Graphic Statics
One end of an elastic string of natural length ‘l’ 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

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

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Applied Mechanics and Graphic Statics
The following is in unstable equilibrium

A uniform solid cone resting on a generator on a smooth horizontal plane
A solid cube resting on one edge
A satellite encircling the earth
A uniform solid cone resting on its base on a horizontal plane

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