(Solved): Two glass balls, one with radius R1, mass m1 and +q1 and the other one with R2, m2 and +q2. Ball #1 ...

Two glass balls, one with radius R1, mass m1 and +q1 and the other one with R2, m2 and +q2. Ball #1 is shoot directly towards ball #2 with speed V1 from an X distance. if ball #1 is shoot too fast the might both break (even though theres repulsive force between them) what is the maximum speed at which ball #1 can be shoot from an x distance to barely touch ball #2 as it reverses direction?