A 120 kg mass is blown apart into an 80 kg piece and a 40 kg piece. After the blast, the two masses are moving apart with a relative velocity of 60 m/s. The total kinetic energy after the explosion is
A. 21 kJ.
B. 35 kJ.
C. 48 kJ.
D. 56 kJ.
E. 82 kJ.
C. 48 kJ.
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