Applied Mechanics and Graphic Statics
A rod 5 m in length is moving in a vertical plane. When it is inclined at 60° to horizontal, its lower end is moving horizontally at 3 m/sec and upper end is moving in vertical direction. The velocity of its upper end, is

1.5 m/sec
1.0 m/sec
2.5 m/sec
0.5 m/sec

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Applied Mechanics and Graphic Statics
A point subjected to a number of forces will be in equilibrium, if

Sum of resolved parts in any two directions at right angles, are both zero
Two resolved parts in any two directions at right angles are equal
Algebraic sum of the forces is zero
Algebraic sum of the moments of the forces about the point is zero

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