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Homework Help: Projectile Motion

  1. Sep 20, 2007 #1
    1. The problem statement, all variables and given/known data

    Bill stands on a bridge kicking stones into the water below.

    A) If Bill kicks a stone with a horiz velocity of 3.5 m/s and it lands in the water a horiz distance of 5.4 m from where he is standing, what is the height of the bridge?

    B) IF the stone had been kicked harder, how would this affect the time it would take to fall?

    2. Relevant equations

    3. The attempt at a solution

    Don't know how to begin.
  2. jcsd
  3. Sep 20, 2007 #2


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    Staff Emeritus
    Science Advisor

    From the horizontal velocity and horizontal distance, one can compute the time traveled.

    During the horizontal travel (same time), the stone also falls under the influence of gravity. How far does it fall in that time?

    A good reference -


    The time of falling is the temporal constraint.
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