Applied Mechanics and Graphic Statics
A particle is dropped from the top of a tower 60 m high and another is projected upwards from the foot of the tower to meet the first particle at a height of 15.9 m. The velocity of projection of the second particle is

16 m/sec
22 m/sec
20 m/sec
18 m/sec

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Applied Mechanics and Graphic Statics
Free body diagram is an

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

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