Applied Mechanics and Graphic Statics
If two bodies of masses M1 and M2(M1 > M2) are connected by alight inextensible string passing over a smooth pulley, the tension in the string, will be given by

T = g(M1 - M2)/(M1 + M2)
T = g(M2 + M1)/(M2 - M1)
T = g(M2 - M1)/(M1 + M2)
T = g(M1 + M2)/(M1 × M2)

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Applied Mechanics and Graphic Statics
Free body diagram is an

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

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