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    Kiwikattyy's Avatar
    Kiwikattyy Posts: 3, Reputation: 1
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    #1

    Apr 28, 2014, 07:05 AM
    A ball is thrown horizontally at 20 m/s from a bridge that is 42 m high. Calculate th
    A ball is thrown horizontally at 20 m/s from a bridge that is 42 m high. Calculate the speed at which the ball strikes the water below
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Apr 28, 2014, 07:30 AM
    Hint: break it down into horizontal and vertical components of motion.
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    Kiwikattyy Posts: 3, Reputation: 1
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    #3

    Apr 28, 2014, 11:09 AM
    So x comp is the 20m/s and y comp is gravity and height ?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #4

    Apr 28, 2014, 11:28 AM
    Quote Originally Posted by Kiwikattyy View Post
    So x comp is the 20m/s and y comp is gravity and height ?
    Yes
    EastCoastGal's Avatar
    EastCoastGal Posts: 24, Reputation: 1
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    #5

    Apr 29, 2014, 02:22 AM
    Use one of your kinetic formulas, they're three basic ones.
    Kiwikattyy's Avatar
    Kiwikattyy Posts: 3, Reputation: 1
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    #6

    Apr 29, 2014, 08:24 AM
    I'm really confused. Could you please show me, with working? Please! :) I'm super desperate haha
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #7

    Apr 29, 2014, 08:37 AM
    First determine the vertical component of velocity of the projetile when it hits the gropund, after falling with acceleration 'g' for a distance of 42 m. This formula ought tio look familiar"



    Here , now solve for . The horizontal component of velocity you already know. Finally use Pythagoras to find the magnitude of the velocity at impact.
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