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**Gravitational Potential Energy and Gravitational Potential**

Why is GPE always negative? (xmphysics)

Can you derive the formula for GPE of two point masses? (xmtutor)

What is gravitational potential? (xmphysics)

**Projectile away from an Astronomical Mass**

Is it possible for one to jump out of the Earth’s gravitational field? (xmphysics)

How do you calculate the escape velocity from the Earth? (xmtutor)

Sketch the energy graphs for a projectile moving away from Earth. (xmtutor)

**Projectile between Two Astronomical Masses**

What is the relationship between *GPE* and *F*_{g}? (xmphysics)

Projectile is launched from Moon. What is the launch speed to reach Earth? (xmtutor)

**Related Staff**

Comparison of Earth and Moon Gravitational Well

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