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Homework Help: Projectile motion velocity homework

  1. Sep 11, 2006 #1
    my problem says:
    a projectile is fired with an initial speed of 75.2 m/s at an agle of 34.5 degrees above the horizontal on a long flat firing range. i figured out everyting so that

    y initial = 0
    y = 92.6m
    Vy initial = 42.6 m/s
    Vy = 0
    g = 9.8 m/s^2
    t = 8.69 s
    Vx = 62 m/s

    the question asks for the volocity of the projetile 1.50 s after firing. how do you go about figuring that out?
  2. jcsd
  3. Sep 11, 2006 #2


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    Homework Helper

    Assuming a vacuum here, and a flat earth, the horizontal component remains constant, so you can ignore it for the moment, and concentrate on the vertical component of velocity and acceleration (which only has a vertical component anyway in this case). After you've done this, then re-include the horizontal component of velocity.
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