2 kg and 3 kg objects slide together, and then they break apart. If the final velocity of 2 kg is 10 m/s, a) Find the velocity of object 3 kg.
b) Find the total change in the kinetic energies of the objects.

P = (2 + 3) * V       where V is their initial speed  (total momentum)

P = 2 * 10 + 3 * Vx     where Vx here would be V3

If the initial momentum is not known how can one determine the final velocity of the 3 kg obj.

Also work depends on the sum of the velocities

W (initial) = 1/2 (2 + 3) V^2     the initial kinetic energy

W (final) = 1/2 * 2 * V2^2 + 1/2 * 3 * V3^2

It appears that more information is required for this problem

newton's first law of motion

okay i have so many questions. but the big one here is: um wt..f is this mess? ?