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

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

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Applied Mechanics and Graphic Statics
The force acting on a point on the surface of a rigid body may be considered to act

On the periphery of the body
On any point on the line of action of the force
At any point on the surface normal to the line of action of the force
At the centre of gravity of the body

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