two bodies having masses M1 and m2 (M1>m2) are attached to the ends of a light inextensible stringpassing over a smooth frictionless pulley.when the system is released M1 moves downward and m2 move upwards with acceleration a.T is the tension of the string.
free body diagram of M1 gives that
unbalanced force F = Mg - T
my question is how the unbalanced force became the difference of the weight and tension? please give me an accurate answer