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Projectile motion of a fired cannon ball

  1. Jun 16, 2015 #1
    1. A cannonball is fired toward a vertical building 400 m away
    with an initial velocity of at 36.9° above the horizontal.
    The ball will hit the building in
    A. 4.0 s. B. 5.0 s.
    C. less than 4.0 s. D. more than 5.0 s.

    2. If the cannonball in the previous question is fired horizontally
    from a 150-m-high cliff, but still 400 m from the building, then
    the ball will hit the building in
    A. 4.0 s. B. 5.0 s.
    C. less than 4.0 s. D. more than 5.0 s


    I used x =(Vo * Cos 36.9)t and got 5.0 s, which is correct, but i don't know how to solve for #2
     
  2. jcsd
  3. Jun 16, 2015 #2

    SammyS

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    What is the horizontal component of velocity in this case?

    By the way: What is the value of V0 ?
     
  4. Jun 16, 2015 #3
    100 m/s, sorry
     
  5. Jun 16, 2015 #4

    SammyS

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    That answers which question?
     
  6. Jun 16, 2015 #5
    The first one.
     
  7. Jun 16, 2015 #6

    SammyS

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    In that case it must have answered both.

    V0 is the horizontal component if it fired horizontally.
     
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