# Worksheet: Escape Velocity

In this worksheet, we will practice calculating the velocity required to escape the pull of a gravitational body given the body's mass and radius.

**Q3: **

The distance from a solar system to the center of the Milky Way is 27,000 light-years. Assume that the mass contained in the sphere of radius 27,000 light-years is 100 billion solar masses, taking 1 solar mass as kg. What is the escape velocity for the Milky Way from the position of this solar system?

**Q4: **

What is the speed needed to escape from the Earth-Moon system from a point on the
surface of Earth? Assume there are no other bodies involved and do **not** account for
the fact that Earth and the Moon are moving in their orbits. Use a value of
km for the
distance between the centers of the Moon and Earth, kg for
Earth’s mass, and kg for the Moon’s mass.

- A m/s
- B m/s
- C m/s
- D m/s
- E m/s