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Homework Help: Projectile Motion, finding g on a planet!

  1. Oct 16, 2008 #1
    1. The problem statement, all variables and given/known data
    An astronaut on a strange planet finds that she can jump a maximum horizontal distance of 10.0 m if her initial speed is 2.40 m/s.

    2. Relevant equations
    What is the free-fall acceleration on the planet? (Ignore air resistance.)

    3. The attempt at a solution
    So in order to this I used both position functions in the x and y directions to get. x_f= 2.40(cos45)t and y_f= 2.40(sin45)t-(1/2)gt^2. i solved for t to get the time which is t= 5.89 seconds. and then now i know i have to find y_f so then i can plug it in and find g! but how am i supposed to find y_f without a equation that is also dependent on g?
  2. jcsd
  3. Oct 16, 2008 #2


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    Science Advisor
    Homework Helper

    Hi steph35! :smile:
    erm … it's obvious what yf is :wink: … it's given in the question, isn't it? :rolleyes:
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