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by JustcallmeEve on February 15th, 2009

JustcallmeEve

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Why is this statement wrong? "A rock is thrown straight into the air. At the peak its acceleration is zero." To me, at the peak it is neither speeding up, slowing down or turning, it's just hanging there. Therefore, zero acceleration...right?

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  • by Outta-here on February 15th, 2009

    Outta-here

    Guys...acceleration is the change of velocity. The rock will slow down, then for an immeasureable instant of time will stop...it's velocity for that time being zero. Therefore the statement is correct. Would you like to see the math? Alec...you were closest...but re-read your answer...there cannot be a negative velocity. (Slower than a stop??), but velocity in a negative direction...on the way up, against gravity.

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