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

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Applied Mechanics and Graphic Statics
The phenomenon of collision of two elastic bodies takes place because bodies

All listed here
Tend to compress each other till they are compressed maximum possible
Attempt to regain its original shape due to their elasticities
Immediately after collision come momentarily to rest

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