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Question
0. Pick up the correct statement from the following :
Options:
A .  The earth pull is treated as a downward vertical force equal to the weight W of the free body and acting through the centre of gravity.
B .  The action of a smooth surface is treated as a force N acting perpendicular to the smooth surface.
C .  The supporting force F acting at a smooth pin or hinge acts in any direction perpendicular to the pin axis.
D .  All the above.
Answer: Option D

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