Hello again! I am having trouble with the following linear momentum problem: A has a mass mA = 9.11x10^31 kg B has a mass mB = 1.67x10^-27 kg They are attracted to each other by some electrical force. Say they are released from rest with a distance between them of Di = 3.0x10^-6 m When their distance is decreased to D = 1.0x10^-6 m, what is the ratio of a) their linear momentums b) speeds c) kinetic energies ----- i know: p = mv so for a) I am looking for: Pe/Pp mAvA/mBvB I have mA and mB, but not vA or vB I know that they are released from rest, but how do you find vA and vB? Can I use V^2 = Vi^2 + 2a(D-Di) ? If so, how do I find the a? Thanks. I just need to be pointed in the right direction.