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    chill00's Avatar
    chill00 Posts: 1, Reputation: 1
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    #1

    Oct 6, 2008, 04:18 PM
    How do you find n and m
    A 2000 kg car is slowed down uniformly from 21.0 m/s to 5.00 m/s in 5.40 s.
    (a) What average total force acted on the car during that time?
    N
    (b) How far did the car travel during that time?
    M
    Credendovidis's Avatar
    Credendovidis Posts: 1,593, Reputation: 66
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    #2

    Oct 6, 2008, 04:24 PM
    Hello chill00

    This link will provide you with a good explanation how to approach this question ! (LINK)

    Also see chapter acceleration !

    Success with your homework !

    :)
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #3

    Oct 7, 2008, 05:13 AM

    For the first one, use F=ma. Here, since the car is deccelerating, so, the acceleration will be negative, or you work it out all positive but then you specify the direction of the force. The acceleration is the rate of change in speed per unit time. I guess you can do it now.

    The other one, try drawing a graph (velocity - time) to help you understand. The distance is given by the area under that graph. It is a trapezium, so, it should be easy.
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