The Hubble Space Telescope Orbits at an Altitude of 600

Multiple Choice

The Hubble Space Telescope orbits at an altitude of 600 km above the Earth's surface. Assuming it is in a stable circular orbit, what is its velocity? For reference, the Earth's radius is 6,400 km and Earth's mass is 6 *10²⁴ kg.

A) 240,000 m/s
B) 7,500 m/s
C) 51,000 m/s
D) 64,000 m/s
E) You also must know the mass of the Hubble Space Telescope to determine its speed.