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Why does this displacement over time graph sloping down have a positive velocity? Intuition would tell me that if it slopes up its positive velocity and if it slopes down its negative velocity. Am I missing something about these graphs or is Khan Academy wrong?

Graph, Answer

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I think it may be trying to catch you out by using the term "speed" instead of "velocity". Speed is a scalar quantity and represents the magnitude of the velocity, so it is always positive. The instantaneous velocity at 1 second is indeed -0.25 m/s, but the speed is 0.25 m/s

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  • $\begingroup$ that was it, I was being blind. Will read instructions next time :) $\endgroup$ – theman25 Sep 30 '17 at 4:38

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