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    akalberts's Avatar
    akalberts Posts: 5, Reputation: 1
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    #1

    Mar 5, 2009, 03:16 PM
    Kinetic Energy
    If a car of mass 1280 kg is moving along a highway at 130 km/h, what is the car's kinetic energy as determined by someone at rest alongside the highway?
    ebaines's Avatar
    ebaines Posts: 12,132, Reputation: 1307
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    #2

    Mar 5, 2009, 03:38 PM

    Kinetic energy is calculated by KE = 1/2 mv^2. KE is usually expressed in units of kg m^s/s^2, or joules. So you should convert the Km/h figure to m/s and then do the calculation.
    Estakhr's Avatar
    Estakhr Posts: 22, Reputation: 0
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    #3

    Apr 30, 2010, 09:10 PM
    30*1000/(60)≤=31.11m/s
    K=Ĺ(1280)(31.11)≤=619kj-->Kinetic energy
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    Nov 19, 2010, 04:18 AM

    Stop reviving threads please.

    Don't answer questions that were asked a long time ago. There is a time reference for each post, so be sure to look for the time before answering the question.

    THREAD CLOSED

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