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    this is part of a question from a past paper and i realy dont see where ive gone wrong

    a cyclist pedalling along a road reaches a steady speed of 5m/s the total mass of cyclist and bike is 120kg
    the total resistive forces are 40N

    find the total distance travelled before coming to a halt assuming resistive force is constant

    i tried calculating the decelleration but got the wrong answer could someone else try

    thanks alot
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    (Original post by sarah12345)
    this is part of a question from a past paper and i realy dont see where ive gone wrong

    a cyclist pedalling along a road reaches a steady speed of 5m/s the total mass of cyclist and bike is 120kg
    the total resistive forces are 40N

    find the total distance travelled before coming to a halt assuming resistive force is constant

    i tried calculating the decelleration but got the wrong answer could someone else try

    thanks alot
    f=ma so a = f/m
    a= -40N/120kg = -1/3 m/s²

    v=u+at
    t=(v-u) /a
    t= -5 / -0.33..
    t=15secs

    so x=ut + ½at²
    x=5*15 - 37.5
    x=37.5m

    or u can use v²=u² +2ax
    0=5² + 2 * 1/3 * x
    x = 75/2
    = 37.5m
 
 
 
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