- #1

raisatantuico

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## Homework Statement

a projectile of mass m is launched vertically from the surface of Planet Islander at a speed that is one-third the escape speed from the surface. If the projectile reaches a maximum height that is a distance h from the surface of the planet, what is the radius of planet islander?

## Homework Equations

Escape Speed = square root of G*mass/radius^2

## The Attempt at a Solution

Is this the correct equation:

1/3 (G*mass/r + h) = G*mass/r

so the radius is equal to 9h? or is it 3h? or h/9?

I am confused as what to what equations to equate? and where the height comes in?

Please help!