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More Projectiles help needed - with a lot more to come! watch

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    Romeo is trying to attract Juliets attention without her nurse, who is in a downstairs room, noticing. He stands 10m from the house and lobs a small pebble at her bedroom window. He throws it from a height of 1m with a speed of 11.5 ms-1 at an angle of 60 degrees to the horizontal.

    From answers to previous questions I have worked out correctly that:

    Time taken to to reach the house is 1.739 seconds
    The pebble travels a vertical distance of 3.5m

    These were calculated using:

    horizontal initial velocity as 11.5cos60
    vertical intial velocity as 11.5sin60

    My question is how do I find out the horizontal and vertical velocitys in order to find the speed on impactof hitting the house?
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    Is this from M2?
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    (Original post by wizz_kid)
    Is this from M2?
    No Mechanics 1 - its OCR MEI
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    The horizontal component of the velocity is unchanged because there is no acceleration in the horizontal direction. The final vertical velocity can be found using v=u+at (using your "proper" variables :p:)
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    (Original post by D-Day)
    The horizontal component of the velocity is unchanged because there is no acceleration in the horizontal direction. The final vertical velocity can be found using v=u+at (using your "proper" variables :p:)
    Well, we like to keep things simple over here lol.
    I got the right answer, thanks for that. I said before I really just need things spelling out to me.
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    Glad to be a help
 
 
 
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Updated: November 8, 2008
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