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    bigbang23's Avatar
    bigbang23 Posts: 1, Reputation: 1
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    #1

    Sep 18, 2008, 10:23 PM
    Physics in acceleration
    A runner covers the last straight stretch of a race in 4 s. During that time he speeds up from 5ms to 9ms. What is the unner acceleration in this part of race?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Sep 19, 2008, 12:58 PM
    Remember that the average acceleration will the change in velocity per unit time. For a problem like this you merely divide the change in velocity (in meters/sec) by the amount of time (in seconds) to get acceleration in meters per second squared:



    Hope this helps.
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