Applied Mechanics and Graphic Statics
The necessary condition of equilibrium of a body is:

Algebraic sum of horizontal components of all the forces must be zero
Algebraic sum of vertical components of all the forces must be zero
Algebraic sum of the moments of the forces about a point must be zero
All (A), (B) and (C)

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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

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

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