Applied Mechanics and Graphic Statics
A body is dropped from a height of 100 m and at the same time another body is projected vertically upward with a velocity of 10 m/sec. The two particles will

Meet after 1 sec
Meet after 10 sec
Meet after 5 sec
Never meet

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Applied Mechanics and Graphic Statics
The following is not a law of static friction:

The magnitude of the limiting friction bears a constant ratio to the normal reaction between two surfaces
The force of friction always acts in a direction opposite to that in which the body tends to move
The force of friction depends upon the roughness of the surface
The force of friction is dependent upon the area of contact

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