newton's laws

[marshall4]

Which one of newton's laws is this equation from and why?

a=[(m1-m2)g]/[m1+m2]

[arcnets]

marshall4,
sorry but I think any law in physics has the form "If...then...".
Could you please explain what your symbols mean, i.e. what physical situation this equation describes? Thanks.

[turin]

It comes from the action reaction law and the a=F/m law.

[nautica]

That would be Newtons second law. Force is proportional to and in the same direction as acceleration and inversial propotional to mass.

Nautica