Projectile Launched from the moon

  • Thread starter Brad2007
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Question: A projectile is launched vertically from the surface of the Moon with an initial speed of 1380 m/s. At what altitude is the projectile's speed two-thirds its initial value?

I don't really know where to start there is so little information. We went over escape velocity in class, but I don't think this is it.
 

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Integral
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Could you solve this problem if it were on the earth?

If so what is the difference between the earth and moon?
 

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