Answer :
Assuming conservation of energy:
Energy before = 7000 + 4000 = 11 000 MJ
Energy after = 2000 + Kinetic = 11 000
Therefore Kinetic = 11 000 - 2 000
Kinetic = 9 000 MJ
Energy before = 7000 + 4000 = 11 000 MJ
Energy after = 2000 + Kinetic = 11 000
Therefore Kinetic = 11 000 - 2 000
Kinetic = 9 000 MJ