When there is NO net external force acting on a system, which one of the following statements concerning the total linear momentum of the system is TRUE?

a. The total linear momentum of the system is increasing.
b. The total linear momentum of the system is decreasing.
c. The total linear momentum of the system is negative.
d. The total linear momentum of the system is equal to zero.
e. The total linear momentum of the system is constant.



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