Svetlana Z. answered 10/26/15
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Female Engineer, UC Berkeley PhD, 30+years industry 1700+ hours tutor
one foot is equal to 12 inches
then 100 feet is equal to 12 * 100 = 1200 inches
Therefore 100 feet per second = 1200 inches per second.
Another way to think about it is, since an inch is smaller than a foot, then if you go 100 feet per second, you would definitely go more than 100 inches per second.