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    The highway code state that a car travelling at 20ms^-1 requires a minimum braking distance of 30m. What deceleration is this and how long will it take for the car to come to rest?
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    this recent discussion should help:

    https://www.thestudentroom.co.uk/sho...4#post74158124
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    (Original post by Wiktoria_Ok)
    The highway code state that a car travelling at 20ms^-1 requires a minimum braking distance of 30m. What deceleration is this and how long will it take for the car to come to rest?
    This is a suvat question - can you write out the variables you’re given and the ones you need to find?
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    (Original post by Protostar)
    This is a suvat question - can you write out the variables you’re given and the ones you need to find?
    How long until you change into a main sequence star?
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    (Original post by Wiktoria_Ok)
    The highway code state that a car travelling at 20ms^-1 requires a minimum braking distance of 30m. What deceleration is this and how long will it take for the car to come to rest?
    Try using v^2=u^2+2as. Remember to use the same convention for which direction is positive for all the variables.
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    u=20 m/s
    v=0
    a=?
    s=30m
    t=?

    To work out a, sub the values into the following equation and then re-arrange:
    v^2=u^2+2as

    To work out t, sub the values into the following equation and re-arrange:
    s=1/2t(u+v)
 
 
 
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