Hello, I'm running a bit behind and would appreciate some help if possible? Thank you

A scientist is investigating a proposed mission to the moon of another planet, in which an observation satellite will orbit the moon. It is planned that the satellite will be placed into a circular orbit about the moon at a distance of 1.8 x 10% m from its centre. One complete orbit will take 12.5 hours. 1. What is the speed of the satellite in m s1? The satellite is held in orbit by the force of gravity. 2. In no more than two sentences, explain how you know from its orbit that it must be being acted on by a force.3. As a result of the orbiting satellite, does the moon move? Explain your answer. (Advisory word count: 50 words)