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Two simple problems

  1. Sep 15, 2005 #1
    1. An astronaut on a strange planet finds that she can jump a maximum horizental distance of 30 m if her initial speed is 9m/s. What is the acceleration of gravity on the planet?

    2. A projectile is fired in such a way that its horizental range is equal to three times its maximum height. What is the angle of projection?

    thanks
     
  2. jcsd
  3. Sep 15, 2005 #2

    arildno

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    3. What has Moneer81 done so far?
     
  4. Sep 15, 2005 #3
    by the way this is not a HW I am not in school i am just practicing...

    well for the first problem I am wondering if it could be done with the little information we have....

    the second one is simpler if we substitute x = 3y into the equations of motion and try to get the x and y component of Vo (initial velocity) then the inverse tangent would give us the angle...

    anyone has more detailed comments?
     
  5. Sep 15, 2005 #4

    arildno

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    1. How is the maximal horizontal distance related to initial speed and acceleration due to gravity?
     
  6. Sep 15, 2005 #5
    well acceleration due to gravity will have an effect on the vertical distance....not the horizental?
     
  7. Sep 15, 2005 #6

    arildno

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    But when&where the ball hits the ground again depends on the acceleration due to gravity, does it not?
     
  8. Sep 15, 2005 #7

    HallsofIvy

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    Do you know the formulas for horizontal and vertical motion with a constant (vertical) acceleration?
     
  9. Sep 15, 2005 #8
    yeah yeah you're right....got it :)
    i think i was just thinking harder that I had to
     
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