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Homework Help: Ezy velocity questions Please help me im desperate

  1. Dec 13, 2009 #1
    Ezy velocity questions!! Please help me // im desperate!!!!

    1. The problem statement, all variables and given/known data

    a)How long does it take an object to fall from a height of 20 m to reach the ground?

    b)if an object is launched horizontally from a height of 20 m with a velocity of 2/m/s where will it hit the ground???

    2. Relevant equations

    we can use the velocity /a cceraltion forumulas

    3. The attempt at a solution

    is part a correct?? i think 20/ 9.8 m/s because its falling vertically which = 2.04 seconds

    but part b im not sure????
     
  2. jcsd
  3. Dec 13, 2009 #2

    rl.bhat

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    Re: Ezy velocity questions!! Please help me // im desperate!!!!

    The first part is wrong.

    Write down the relevant equations.
     
  4. Dec 13, 2009 #3
    Re: Ezy velocity questions!! Please help me // im desperate!!!!

    The relevant equation will be okay the equation for velocity

    velocity= distance / time

    we have been given the distance which is 20 m, and were trying to find time , ??
     
  5. Dec 13, 2009 #4

    rl.bhat

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    Re: Ezy velocity questions!! Please help me // im desperate!!!!

    It is true only the velocity is uniform. In a freely falling body the velocity is not constant.
    Go through the other kinematic equation for accelerating bodies.
     
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