A climate-monitoring satellite travels in a stable, circular orbit around the Earth at a constant speed, as shown in the diagram below.
Which statement about the satellite's motion is correct?
The linear momentum of the satellite is constant because its orbital speed and mass do not change.
The acceleration of the satellite is zero because its speed along the circular path remains constant.
The gravitational force of the Earth acts as a resultant force directed towards the centre of the orbit, perpendicular to the instantaneous velocity.
The work done by the gravitational field on the satellite during any orbital displacement is proportional to the distance traveled.