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Homework Help: Projectile Motion(difficulty level-7)

  1. Jan 24, 2005 #1
    A football is kicked at an angle of 50 degrees and travels a distance of 20 m before hitting the ground.

    What is the initial speed of the ball? (14.1 m/s)
    How long is it in flight? (2.2 sec)
    How high does it rise? (5.94 m)

    I have the answers but I don't know where to go with the information that is given. If anyone could help explain this problem, it would be greatly appreciated! Thanks!
  2. jcsd
  3. Jan 24, 2005 #2
    difficulty level: 0.0000000000000000000000000000000000000000000000001

    1. the x and y components are independent.
    2. write down the equation for x and y component (the final v_y is -v_y)
    3. the initial V_y and V_x are related by tan(theta)
    4. you have 3 eq 3 unkn (v_x,v_y,t)....... solve it
  4. Jan 24, 2005 #3
    alrighty..i think i understand what your saying. Thanks! I just have problems understanding how to get the velocities. Thanks again!
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