Applied Mechanics and Graphic Statics
A ball moving with a velocity of 5 m/sec impinges a fixed plane at an angle of 45° and its direction after impact is equally inclined to the line of impact. If the coefficient of restitution is 0.5, the velocity of the ball after impact will be

3.5 m/sec
2.5 m/sec
1.5 m/sec
0.5 m/sec

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Applied Mechanics and Graphic Statics
Free body diagram is an

Isolated joint with only body forces acting on it
None of these
Isolated joint with all the forces, internal as well as external, acting on it
Isolated joint with internal forces acting on it

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

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