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Skoool.ie - Applied Maths errors

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  • 11-10-2008 2:11pm
    #1
    ironclaw
    Registered Users Posts: 8,004 ✭✭✭


    Hi Folks,

    Was doing my papers today and found the following. On Skoool.ie App Maths section, under "Projectiles" (http://www.skoool.ie/skoool/examcentre_sc.asp?id=2590) you'll find the formulas for horizontal planes.

    In particular, this one: Projectiles-003.gif

    It should read: u SinA - gt (i.e. (Intial Velocity x Sine Alpha) minus (Gravity x Time)

    I checked in my book and I am 99% sure I'm right.

    Any ideas?


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    #2
    PurpleFistMixer
    Registered Users Posts: 5,851 ✭✭✭PurpleFistMixer


    It sort of looks like they're giving the equation for the initial speed (often denoted with a u instead of a v), ie when t=0, but they don't state it, which is erroneous.
    But yes, of course for the general expression you'd need a gt in there.


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