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23 September, 14:51

A runner accelerates to 4.2 m/s2 for 10 seconds before winning the race. How far did he/she run?

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Answers (2)
  1. 23 September, 15:00
    0
    Runner will run for 210m

    Step by Step Explanation:

    According to Newton's first of motion,

    Vf=Vi+at

    Given is

    the speed with which runner is running will be Vi, he is running with accelertion a=4.2m/s2 fot time t=10sec

    Vf will be 0 because runner will stop after winning the race

    we will find Vi from equation 1,

    Vi=Vf-at

    = 0 - 4.2*10

    =-42 m/s (negative sign is showing decceleration)

    So, Vi=42 m/s

    According to Newton's third of motion,

    2aS = Vf^2-Vi^2

    S is distance, he will cover before stopping,

    2 (4.2) S = 0 - 42^2

    S=1764/8.4

    S=210m

    Runner will run for 210m
  2. 23 September, 16:32
    0
    She run the distance of 42metres
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