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Which one of the following statements concerning the momentum of a system when the net force acting on the system is equal to zero newtons is true?

a) The momentum of the system is increasing.

b) The momentum of the system is decreasing.

c) The momentum of the system is equal to zero kg×m/s.

d) The momentum of the system has a constant value.

e) The momentum of the system has a negative value.

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