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!

Jumping off a snow pile

  1. Dec 19, 2015 #1
    1. The problem statement, all variables and given/known data
    The diagram shows a kid jumping off a snow pile into the grown that is also covered with snow. So the kid is jumping up and then lands on the ground.
    https://scontent-arn2-1.xx.fbcdn.net/hphotos-xpf1/v/t34.0-12/12380374_1234806623215387_1066477107_n.jpg?oh=fe84392440a1ddbf0eebf557109d56ec&oe=5677CAA8
    The question is: how tall is the snow pile if the ground is 0 m?
    2. Relevant equations

    S=v0t + (at^2)/2

    3. The attempt at a solution
    I am thinking that the kid is at its highest point when the velocity is zero and t=0.4. It takes 0.4 seconds up and also 0.4 seconds down to the level where the snow pile was at. so the snow piles height is from 0.8 seconds to 1,2 seconds. 1.2-0.8=0.4
    s= -4*0.4 + (9.82 * 0,4^2)/2 = - 0,8144

    What went wrong in my assumptions or solution?

    upload_2015-12-19_14-42-36.png
     
  2. jcsd
  3. Dec 19, 2015 #2

    NascentOxygen

    User Avatar

    Staff: Mentor

    If it's headed downwards, you are denoting this as a negative velocity, so g in your equation will likewise be negative.
     
  4. Dec 19, 2015 #3

    gneill

    User Avatar

    Staff: Mentor

    Also, when the velocity is at its most negative point, that's when the kid reaches the top of the layer of snow that's on the ground, not the ground itself. Ponder the finish of the velocity vs time graph.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Jumping off a snow pile
  1. Jumping off a building (Replies: 6)

  2. Jumping off a boulder (Replies: 15)

Loading...