A 120 Kg Mass Is Blown Apart into a 80

A 120 kg mass is blown apart into a 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 velocity of the 80 kg mass is

A) 59 m/s.
B) 51 m/s.
C) 34 m/s.
D) 20 m/s.
E) 14 m/s.

Correct Answer:

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