Net force

[soulja101]

1. The problem statement, all variables and given/known data
A net force of magnitude 36N gives mass m1 an accerlation of magnitude 4.0m/s2. The same net force gives another accleration of 12m/s2. What magnitude of accleration will this net force give to the entire mass if m1 and m2 are fastened together.


2. Relevant equations
Fnet=ma


3. The attempt at a solution
m1=fnet/a m2=36N/12ms2
=36N/4.0ms2 m2=3kg
=8kg

m1+m2=12kg

Fnet=ma
a?
a=fnet/m
36N/12Kg
3ms2

[cristo]

That's correct.