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7 November, 04:06

A runner covers the last straigjt stretch of a race in 4 s. during that time, he speeds up from 5m/s to 9m/s.

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  1. 7 November, 04:16
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    During that final period of time,

    his acceleration is

    (9 m/s - 5 m/s) / (4 sec) = 1 m/s².

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