Posted by **Mary** on Thursday, November 19, 2009 at 6:00pm.

A projectile is launched vertically from the surface of the Moon with an initial speed of 1400 .

At what altitude is the projectile's speed one-half its initial value?

do you use the equation Ei = Ef and vf would be 700

E= 1/2 mv^2 -G (Mass of the moon/radius)

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