1. The problem statement, all variables and given/known data [PLAIN]http://img208.imageshack.us/img208/9987/forcediagram.png [Broken] In the figure above, two small objects (magnets for instance) of the same mass exert forces on each other of a magnitude F. When object A is subjected to an external force of 3.6x10^-2 N, A accelerates at 1.6 m/s/s and B accelerates at 2.1 m/s/s as shown. Find F. Neglect other forces, assume accelerations are parallel. 2. Relevant equations F=ma ƩF = ƩmƩa 3. The attempt at a solution I'm not sure if the solution i got is entirely correct but this is it ƩF(A) = 3.6x10^-12 ƩF(B) = (3.6x10^-2) + F I got this because B is accelerating faster which means the force on B must be greater if the masses are equal. Using this, I found the mass of A, by F = ma 3.6x10^-2 = m(1.6) m = .0225 kg, so A and B are .0225 kg To find F, I substitute the mass into F = ma for F(b) So (3.6x10^-2)+ F = .0225*2.1 F = 1.13x10^-2 N Is that correct?