Applied Mechanics and Graphic Statics
When a body of mass M1 is hanging freely and another of mass M2 lying on a smooth inclined plane(α) are connected by a light index tensile string passing over a smooth pulley, the acceleration of the body of mass M1, will be given by

g(M2 + M1 sin α)/(M1 + M2­) m/sec²
g(M1 + M2 sin α)/(M1 + M2­) m/sec
g(M2 × M1 sin α)/(M2 - M1­) m/sec²
g(M1 - M2 sin α)/(M1 + M2­) m/sec²

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Applied Mechanics and Graphic Statics
Newton’s Law of Motion is:

Everybody continues in its state of rest or of uniform motion in a straight line, unless it is acted upon by some external force
All listed here
To every action, there is always an equal and opposite reaction
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts

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