A 1.00 x 10*-kg train car moving due east at 29.0 m/s collides with and couples to a 2.00 × 10*-kg train car that is initially at rest.

What is the common velocity uf of the two-car train after the collision?

What is the total kinetic energy K; of the two train cars before the collision?

What is the total kinetic energy K, of the two train cars after the collision?