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Physics please help!!

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The launching speed of a certain projectile is 9.0 times the speed it has at its maximum height. Calculate the elevation angle at launching.

  • Physics please help!! -

    at start u = u forever
    Vi = Vi
    u^2 + Vi^2 = 81 u^2
    so
    Vi^2 = 80 u^2
    Vi = 8.94 u
    tan A = Vi/u = 8.94
    so
    A = 83.6 degrees above horizontal

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