[Jasper109]

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Jasper,

Wait a sec, so you're saying it is reasonable to make some basic assumptions about what they mean in the question based on the information given?

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Yes, but when 0m/s is one of the choices (for no rational reason) a can of worms is needlessly opened. That, IMO, is the main flaw in the question.

That answer is completely unreasonable given basic assumptions, so for someone doing the question it might lead them to consider other possible scenarios or explanations.

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so you feel that tests should not include wrong answers that may seem reasonable to people who think they understand the question?

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I'm just saying that including 0m/s makes it more likely for someone answering the question to interpret it in a way that the person writing the question had not intended.

If you have 4 choices that are all non-zero the whole issue of the rock eventually coming to rest at some final point in time is avoided.