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1 point

My mistake, I didn’t check his math. I thought he was saying if you take distance apart at t(n) and subtract distance apart at t(n-1) you will get distance/sec.

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1 point

Only if you divide by time. Including units is an essential sanity check.

Also, the rest of the math needs to be correct.

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1 point

Well that’s my point. The answer is correct in this specific case, because it’s already “built-in” so to speak.

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1 point

No, their answer is wrong.

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