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

A runner covers the last straight stretch of a race in 4 s. During that time, he speeds up from 5 m/s to 9 m/s. What is the runner’s acceleration in this part of the race?

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  1. Given,
    Time taken to cover the last last straight stretch of a race = 4 seconds
    He speeds up from 5 m/s to 9 m/s
    To find,
    The acceleration of the runner.
    Solution,
    We can simply solve this numerical problem by using the following process.
    Here,
    Initial velocity (u) = 5 m/s
    Final velocity (v) = 9 m/s
    Time (t) = 4 seconds
    Acceleration (a) = ?
    According to the formula of kinematics,
    a = (v-u)/t
    a = (9-5)/4 [By putting the given values.]
    a = 4/4 = 1 m/s²
    (We have used SI unit of the acceleration, because all the initial physical quantities are also in SI units.)
    Hence, the acceleration is 1 m/s²

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