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Projectile motion

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A cannon is fired from a cliff top 15m high and at 30 degrees. It takes 3 seconds for canon to reach the earth, what is the initial velocity of the cannon

  • Projectile motion -

    h = (Vo*sin(-30))*(t) + 0.5g*t^2=15 m.
    (Vo*sin(-30))*(3) + 4.9*3^2 = 15
    -1.5Vo + 44.1 = 15
    -1.5Vo = 15-44.1 = -29.1
    Vo = 19.4 m/s.

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