At this moment Derick was in the act of pitching his lamp-feeder at the advancing boats, and also his oil-can; perhaps with the double view of retarding his rivals’ way, and at the same time economically accelerating his own by the momentary impetus of the backward toss.
) "The aorta of a whale is larger in the bore than the main pipe of the water-works at London Bridge, and the water roaring in its passage through that pipe is inferior in impetus and velocity to the blood gushing from the whale’s heart."
There are no more uses of "impetus" in the book.
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Budget cuts were the impetus for the reorganization.
The Supreme Court decision provided the impetus for the change.