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    pop000's Avatar
    pop000 Posts: 352, Reputation: 6
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    #21

    Feb 28, 2011, 08:40 AM
    Comment on Unknown008's post
    OK thank you :)
    pop000's Avatar
    pop000 Posts: 352, Reputation: 6
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    #22

    Mar 3, 2011, 06:25 AM
    Hi I got this way for answer what do you say?

    (my teacher gave me this way)



    I would like to know what you think. :)

    Thanks.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #23

    Mar 3, 2011, 06:48 AM

    Well, if you work out the first calculation... do you get 4320 kJ? I'm still getting 1080 kJ
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    jcaron2 Posts: 986, Reputation: 204
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    #24

    Mar 3, 2011, 07:58 AM

    I think your teacher took the 1/2 term in front of the kinetic energy calculation and accidentally multiplied by 2, instead of dividing by 2.

    You should point out to him that if you fired an object from a canon straight up into the air, it would have to be traveling almost 200 km/h to attain a height of 150m. Logic should tell you that an object slowing from 100 km/h to 50 km/h is certainly not going to climb anywhere near that much altitude!
    pop000's Avatar
    pop000 Posts: 352, Reputation: 6
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    #25

    Mar 3, 2011, 08:30 AM
    OK I will as her.
    If both of you tell there a mistake so I think there a mistake :)
    pop000's Avatar
    pop000 Posts: 352, Reputation: 6
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    #26

    Mar 3, 2011, 08:35 AM
    Comment on pop000's post
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