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when the velocity of a mass on a spring is zero, the acceleration is at a maximum .

c

explanation:

the answer would most likely be c, because if it's a comical piece of information, it may likely not be true, if it's a site that allows anybody to edit the content, it could mean a five year old is typing the info, and if it's a tv show produced by a celeb, it may have a biased opinion.

that would be because of both gravity and friction. so     c