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    gregorio13's Avatar
    gregorio13 Posts: 4, Reputation: 1
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    #1

    Oct 1, 2008, 05:29 PM
    Who knows this
    In coming to a stop, a car leaves skid marks 79m long on the highway. Assuming a deceleration of 6.2m/s2 , estimate the speed of the car just before braking... I don't need th answer I need the givens
    Credendovidis's Avatar
    Credendovidis Posts: 1,593, Reputation: 66
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    #2

    Oct 1, 2008, 06:25 PM
    Quote Originally Posted by gregorio13 View Post
    In coming to a stop, a car leaves skid marks 79m long on the highway. Assuming a deceleration of 6.2m/s2 , estimate the speed of the car just before braking... i dont need th answer i need the givens
    This link will provide you with a good explanation how to approach this question ! (LINK)

    Also see chapter acceleration !

    Success with your homework !

    :)
    excon's Avatar
    excon Posts: 21,482, Reputation: 2992
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    #3

    Oct 1, 2008, 06:27 PM
    Hello g:

    Four.

    excon
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    Oct 5, 2008, 09:26 PM

    I would use a sketch graph. Using vectors, the vector for the decceleration will be

    (1 )
    (6.2)

    So, distance covered in 1 s= (1 x 6.2)/2 = 3.1m
    For 79m, then (79/3.1)=25.48s = 25.5s

    Therefore, initial speed = 6.2 x 25.5 = 158 m/s
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