1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Vertical throw initial height 15 time 3s until hiting ground

Tags:
  1. Nov 1, 2016 #1
    1. The problem statement, all variables and given/known data
    Height - 15m
    Time when ball hits the ground after upward throw 3 s.

    I have been trying to find intitial speed with these formulas :
    d=v_initial*t-0.5*g*t^2
    and
    v=v_initial+g*t

    Please help to understand how to find initial speed and after what time the ball is at 15m height again.
     
  2. jcsd
  3. Nov 1, 2016 #2

    PeroK

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    You need to post what you've done. Hint: what do you know about quadratic equations?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted