Conservation of energy/momentum

1. The problem statement, all variables and given/known data
In a railroad accident, a boxcar weighing 200 kN and traveling at 3.00 m/s on a horizontal track slams into a stationary caboose weighing 400 kN. The collision connects the caboose to the boxcar. How much energy is transferred from kinetic energy to other forms of energy in the collision?

2. Relevant equations
KE= 1/2 m v^2
P= mv

3. The attempt at a solution
KE initial= 1/2 (200000) (3)^2
=900000 J
P initial= 200000 (3)
=600000 kg m/s

I have no idea where to go from here

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