1. Jan 7, 2015 #1

   julianwitkowski

   

   1. The problem statement, all variables and given/known data
   
   Equation for the time of a free fall with an initial velocity?
   
   2. Relevant equations
   
   √ (2 ⋅ h / a )
   
   3. The attempt at a solution
   
   Is it √ (2 ⋅ h / v_ia )
   
   
   Thanks for the help :)

    

   julianwitkowski, Jan 7, 2015
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3. Jan 7, 2015 #2

   Andrew Mason

   

   Science Advisor

   Homework Helper

   Your guess is not correct. Your first equation is correct if the object is at rest (v_i=0). If initial velocity is not 0 you have to factor in a v_it term and work t out from the quadratic equation:
   
   (1/2)gt² + v_it - h = 0
   
   (where h is the distance fallen).
   
   AM

    

   Last edited: Jan 7, 2015

   Andrew Mason, Jan 7, 2015

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