Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Projectile Question PLEASE HELP

  1. Sep 30, 2007 #1
    Thank you for everyones help.
     
    Last edited: Sep 30, 2007
  2. jcsd
  3. Sep 30, 2007 #2
    Sorry but I didn't understand your solution. :( But my approach will be : Calculate distance traveled by them at any instant and add them up. There sum is equal to height of tower.
     
  4. Sep 30, 2007 #3
    We have two variables, time and height, and two equations, one for the first object and one for the second.

    The equation for the first object is x= (xi) -(vi)(t) - (1/2)(g)(t^2) , where xi= initial height= 60 m
    The equation for the second object, since g is working against the motion, is x= (xi) + (Vi)(t)-(1/2)(g)(t^2), vi= initial velocity, and xi= initial position/height= 0 m


    Plug in your knowns, and solve the system of equations.


    ------
    On second look I see that you did this for your second attempt, and this is correct as far as I know-- 40.9 m. There must be a mistake in your first attempt.

    Your first attempt is confusing, I can't really tell what you did. Maybe your position-time equation for the first object is incorrect. What equation did you use for your first object? Leave out units for now so I can see what you did.
     
    Last edited: Sep 30, 2007
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook