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    Kobe_6924's Avatar
    Kobe_6924 Posts: 2, Reputation: 1
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    #1

    Feb 27, 2011, 05:58 PM
    Homework help
    1) an electron is accelerated to 200m/s in a distance of 3G. What was the acceleration of the electron? 2) a rock is thrown 30m high. How long does it take to be caught at the same level? Please help my teacher said there's a quiz tomorrow but she hasn't taught much
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Feb 28, 2011, 07:54 AM

    1. Um... what does '3G' mean? I never saw that before...

    Anyway, use the kinematics formula:



    v = final velocity
    u = initial velocity
    a = acceleration
    s = distance

    2. Another equation that might help you is:



    And taking into account that the time to go up is the same time to go down, you take the time for the stone to fall down from 30 m, that is the initial velocity = 0, s = 30, a = g
    Kobe_6924's Avatar
    Kobe_6924 Posts: 2, Reputation: 1
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    #3

    Feb 28, 2011, 04:51 PM
    Comment on Unknown008's post
    Hey thanks I meant 3m but I understood that formula! Thanks again!
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    Mar 1, 2011, 06:33 AM

    Lol, okay, cheers! :)
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