NASA GRAIL Mission - Twin spacecraft in orbit around the Moon right now!

Photo Rights: NASA

JURBAN is bring back the K-12th grade, Design-a-Mission contest. It's your chance to win $15, help us double check our math & physics, and be involved in a real mission to the moon. Christoper Flanagan won the last contest with an answer of 2.95 meters, for the following question "Determine the max height our air bag landing system can fall from (starting with zero velocity), and the hit lunar surface at less than 3.1 m/s 

This months question is, "What will be the orbital speed of our airbag lander, as it orbits in a perfect circle 100 km above the Moon's surface?"

Hints:

• The Moon radius is 1737.10 km - Source wikipedia
• Mass of our lander (220 kg) can be ignored for this problem because 220 kg is A LOT LESS THAN 7.3477 × 10²² kg (mass of the Moon)
• The Physics Classroom website - http://www.physicsclassroom.com/class/circles/

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