A 120 Kg Mass, Initially at Rest, Is Blown Apart

question 87

Multiple Choice

A 120 kg mass, initially at rest, 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.

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