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common difference of arithmetic progression or sequence

Common difference of arithmetic progression or sequence is defined as the difference between the two consecutive terms in the arithmetic progression or sequence or series.  It is constant across the whole series if $a_1$,$a_2$ ,$a_3$.$a_4$ …..  are in arithmetic progression or sequence then $d=a_2 -a_1 = a_3 -a_2 =a_4 -a_3$…. If the common difference is

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How to solve problems with Body in Static equilibrium

Draw a neat diagram of the system.

Firstly consider the origin of the forces acting on the each object.To do this find out the field forces acting on the each object.Wherever contact in available account the contact force carefully

Isolate the object being analyzed. Draw a free-body diagram and then show
and label all external forces acting on the object, indicating where those forces are applied.This way there will not any confusion about the force acting on each object.

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