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Math Help - Vectors

  1. #1
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    Vectors

    t seconds after a certain projectile is launched from the ground, it has a vertical upwards velocity component of 69.0 - 9.80t m/s. Given that is has a constant horizontal velocity component of 15.0m/s, find it's velocity (i.e its speed and direction of motion): 2 seconds after launch and 7 seconds after launch. (state direction as angles made with horizontal)

    Please help with the answer!!!
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  2. #2
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    Quote Originally Posted by kingtim04 View Post
    t seconds after a certain projectile is launched from the ground, it has a vertical upwards velocity component of 69.0 - 9.80t m/s.
    ?? You mean the initial vertical velocity is 69.0 m/s and the vertical acceleration is -9.8 m/s^2 don't you?

    Given that is has a constant horizontal velocity component of 15.0m/s, find it's velocity (i.e its speed and direction of motion): 2 seconds after launch and 7 seconds after launch. (state direction as angles made with horizontal)

    Please help with the answer!!!
    If acceleration is a constant, a, then the speed after time t is at+ initial speed. Of course, for horizontal motion, the acceleration is 0 so the horizontal speed remains constant.
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