A satellite orbits the earth at constant speed in a perfectly circular orbit (recall that the gravitational force on the satellite always points radically inward toward the center of the earth). when the satellite has moved a short distance along the orbit, which of the following statement is true
a. The gravitational potential energy of the satellite has decreased
b. The gravity does negative work on the satellite during the motion
c. The gravitational work done on the satellite is zero
d. The satellite's velocity is zero.
e. None of the above