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Math Help - angular velocity

  1. #1
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    angular velocity

    A projectile is launched at 36 m/s and travels 100 m horizontally. If it is to be able to just barely clear a 10 m wall, between what two angles should the projectile be launched with respect to the horizontal?

    i have almost no idea what to do!
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  2. #2
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    Quote Originally Posted by trigunesq View Post
    A projectile is launched at 36 m/s and travels 100 m horizontally. If it is to be able to just barely clear a 10 m wall, between what two angles should the projectile be launched with respect to the horizontal?

    i have almost no idea what to do!
    HI

    This is my take on it ..

    THe projectile has to satisfies two condition
    (1) Travel a range of 100 m
    (2) able to clear the wall (maximum height) of 10 m

    Range , R =\frac{u^2\sin 2\theta}{g}

    100=\frac{36^2\sin 2\theta}{10}

    \theta=25.25^o

    Now maximum height , H = \frac{u^2\sin^2 \theta}{2g}

    10=\frac{36^2\sin^2 \theta}{20}

     <br />
\theta= 23.13^o<br />

    I don understand what it means by between 2 angles .. but the angle should be > 25.25 .
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