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    TOBY04 Posts: 3, Reputation: 1
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    #1

    May 17, 2012, 04:12 PM
    Physics grade 12
    A water balloon is launched horizontally with a speed of 5.2 m/s from a balcony that is 6.20 m above the ground. Determine the velocity of the balloon when it strikes the ground below.
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    ebaines Posts: 12,131, Reputation: 1307
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    #2

    May 17, 2012, 04:20 PM
    Hint: the horizontal component of velocity will remain a constant 5.2 m/s, and the vertical component of velocity when the object hits the ground will be the same as for an object that is dropped from a height of 6.2m. Can you complete the problem from here?
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    #3

    May 17, 2012, 04:23 PM
    nope, I thought deltady=1/2gt^2
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    #4

    May 18, 2012, 05:47 AM
    Quote Originally Posted by TOBY04
    nope, i thought deltady=1/2gt^2
    The equation y=1/2 gt^2 is a good one to use to calculate the time it takes for the object to hit the ground. But to find the velocity you can use the formula:



    For an object being dropped , and you know that . Solve for . That'll give you the vertical velocity of the object at impact. You already know the horizontal velocity - you can use Pythagoras to find the total velocity.
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    #5

    May 18, 2012, 06:30 AM
    Thanks
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