Applied Mechanics and Graphic Statics
The characteristic of a couple is:

A couple can be never the balanced by a single force
Algebraic sum of moments of forces, constituting a couple, about any point, is same
All listed here
Algebraic sum of forces, constituting a couple is zero

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Applied Mechanics and Graphic Statics
The masses of two balls are in the ratio of 2 : 1 and their respective velocities are in the ratio of 1 : 2 but in opposite direction before impact. If the coefficient of restitution is ½, the velocities of separation of the balls will be equal to

Half the original velocity in the opposite direction
Original velocity in the opposite direction
Half the original velocity in the same direction
Original velocity in the same direction

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Applied Mechanics and Graphic Statics
Pick up the correct statement from the following. A rubber ball when strikes a wall rebounds but a lead ball of same mass and velocity when strikes the same wall, falls down

Momentum of rubber ball is less than that of lead ball
Change in momentum suffered by lead ball is less that of rubber ball
Rubber and lead balls undergo equal changes in momentum
None of these

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