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A sprinter runs with an average acceleration of 4.5 m/s². What is the sprinter's speed 2 s after leaving the starting blocks?
 Sep 24, 2013
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Well, you'll just want to add 4.5 twice. Every second the sprinter runs, he gains 4.5 m/s². At one second in, they'll be running at 4.5 m/s², then just add 4.5 to that. So two seconds in, they'll be running 9 m/s².
 Sep 25, 2013

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