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Math Help - Check this one out Physics

  1. #1
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    Check this one out Physics

    A rock is thrown vertically upward with a speed of 15 m/s. What are its speed and direction 2 s later?

    v1= 15 m/s
    t= 2s
    A = -9.8 m/s^2

    V2= (-9.8)(2) + 15
    -19.6 + 15
    -4.6 m/s and it goes up

    Ok this looks right but?
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  2. #2
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    Re: Check this one out Physics

    Quote Originally Posted by Louisana1 View Post
    A rock is thrown vertically upward with a speed of 15 m/s. What are its speed and direction 2 s later?

    v1= 15 m/s
    t= 2s
    A = -9.8 m/s^2

    V2= (-9.8)(2) + 15
    -19.6 + 15
    -4.6 m/s and it goes up ???

    Ok this looks right but?
    come on LA1 ... what does the negative sign tell you regarding the rock's direction of motion?
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  3. #3
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    Re: Check this one out Physics

    That it goes down???
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  4. #4
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    Re: Check this one out Physics

    Quote Originally Posted by Louisana1 View Post
    That it goes down???
    yes ... vectors have both magnitude & direction.
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