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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


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    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:
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