Calculate the escape speed from the Earth for a 4800 kg spacecraft and determine the kinetic energy it must have at the Earth's surface to move infinitely far away from the Earth.
Suppose the rocket was initially on a circular orbit around Earth with a period of 1.2 days.
(a) What is its orbital speed?
Determine the radius of the orbit and the speed of the rocket from the requirement that the centripetal force keeping the rocket in orbit is the gravitational force.