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!

Homework Help: Time, Velocity, and Gravity

  1. Aug 7, 2008 #1
    1. The problem statement, all variables and given/known data
    If I throw a ball straight up to a height h with velocity v and it takes the ball time t to go up and back to my hands, by how much would time increase or decrease if gravity on earth where changed from g to g/6?

    2. Relevant equations

    v = a*t

    3. The attempt at a solution

    I wanted make sure what I am thinking was correct. I thought about this problem as a projectile problem and said that t = (v*sin(theta))/a, where "a" is acceleration. Now since the ball was thrown straight up, I made sin(theta) to sin(90). So the problem comes out to be t=v/a, and since "a" decreases by a factor of 6 that means time increase by a factor of 6. Would this reasoning be the correct way to do it?
  2. jcsd
  3. Aug 7, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper

    Hi Gear2d! :smile:

    Your reasoning and your result are right … but your initial equation is wrong.

    The general equation is v2 - v1 = at …

    so what do you think it is in this particular case? :smile:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook