Condition for Momentum Conservation
An object with a mass of 5 kg explodes into three fragments with respective masses of 2 kg, 2 kg, and 1 kg. Which condition must be met for the momentum of one of the 2 kg fragments to be conserved?
A
If it moves perpendicular to the other fragments
B
If the explosion occurs in a vacuum
C
If the net external force on the fragment is zero
D
If the original object was at rest
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