On February 9, 2009, United States and Russian satellites collided in orbit 790 km above the earth's surface producing thousands of debris. Assuming a circular orbit, what was the orbital period of the two colliding satellites?

• A. 101 min
• B. 98.6 min
• C. 92.3 min
• D. 1.17 years
• E. 84.4 min
• F. 3.68 min

Answer: (A)