Question

An unmanned spacecraft of mass 492 kg, is in a circular orbitaround the earth, observing the earth's surface from an altitude of53.8 km.
part A. What is the orbital speed of the spacecraft?
part B. What is the period of the spacecraft's orbit?
part C. What is the escape velocity of the spacecraft?
part D. To the dismay of scientists, an electrical fault causes anon-board thruster to fire, decreasing the speed of the spacecraftby 23.9 m/s. If nothing is done to correct its orbit, with whatspeed will the spacecraft crash into the earth's surface?