1. Not finding help here? Sign up for a free 30min 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 Motion under Gravity Q)

  1. Jun 6, 2007 #1
    1. The problem statement, all variables and given/known data
    Apologies for so many posts, however this is the last question.

    A stone his thrown vertically upwards with speed 16m/s from point h meters above the ground. The stone hits the ground 4s later.
    Find the value of h.

    3. The attempt at a solution
    I really haven't a clue on how to start this question, I haven't really encoutered this before, and would end up doing my own sledgehammer way.
    But otherwise, can someone people give hints on how to solve this, I know all the kinematic equations, its just this situation confuses me cause of h.

    Thanks in advance.
  2. jcsd
  3. Jun 6, 2007 #2
    delta y = (voy)t - 4.9t^2

    when the stone hits the ground, its vertical displacement will be the opposite of its initial height ...

    delta y = -h

    -h = 16t - 4.9t^2

    sub in t = 4 ... h = ?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Vertical Motion under Gravity Q)
  1. Motion Under Gravity (Replies: 13)