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26 January, 16:02

How much time is needed for a boy on roller skates to slow down from 17.4

m/s to 9.11 m/s if he covers 45.0 m?

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  1. 26 January, 17:13
    0
    Step-by-step explanation:

    v²-u²=2as

    9.11²-17.4²=2a*45

    a = - (17.4²-9.11²) / 90 = - (302.76-82.9921) / 90=-219.7679/90 m/s²

    v=u+at

    9.11=17.4-219.7679/90 t

    9.11-17.4=-219.7679/90t

    -8.29*90=-219.7679t

    t=-746.1/-219.7679≈3.395 s
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