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: Amusment park yesterday for physics class

  1. May 12, 2004 #1
    When to an amusment park yesterday for physics class. Went on a ride called the "hellevator" where you sit down and it shoots up a certain distance then lets you free fall. My question is if the acceleration upwards occurs in the first 5 meters how do you figure out that acceleration?
  2. jcsd
  3. May 13, 2004 #2


    User Avatar
    Science Advisor

    You are going to need more information to find the acceleration.

    Given an acceleration of a m/s2, the speed after t seconds is v= at and the height is h= (1/2)at2.

    If you know the time, T, taken to get to that first 5 meters, you could solve
    5= (1/2)a(T2): a= 10/T2.

    After that first time, T, you continue upwards under the influence of grativity:
    you speed at time t will be v= -g(t-T)+ aT and height will be h= 5+aTt- (1/2)g(t-T)2.

    At the maximum height, v= -g(t-T)+ aT= 0 so you can solve for t (in terms of T). If you know that maximum height (usually easier to measure than time), you could solve the second equation for a.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook