The satellite’s orbital period is 2h 2min 41.8s

In order for the satellite to stay in orbit its vertical must be null. Therefore its centrifugal acceleration must be the opposite of Mars’ gravitationnal acceleration.

The satellite is ##488##km above Mars’ surface and the planet’s radius is ##3397##km. Therefore Mars’ gravitationnal acceleration is:

##g=(GcdotM)/d^2=(6.67*10^(-11)cdot6.4*10^23)/(3397000+488000)^2=(6.67cdot6.4*10^6)/(3397+488)^2~~2.83##m/s

The satellite’s centrifugal acceleration is:

##a=v^2/r=g=2.83##

##rarr v=sqrt(2.83*3885000)=sqrt(10994550)=3315.8##m/s

If the satellite’s orbit is circular then the orbit’s perimeter is:

##Pi=2pi*3885000~~24410174.9##m

Therefore the satellite’s orbital period is:

##P=Pi/v=24410174.9/3315.8=7361.8s##