$2.$ A $20\mathrm{.}0$ kg satellite has a circular orbit with a period of $2\mathrm{.}40$ h and a radius of $8\mathrm{.}00\backslash$times $106$ m around a planet of unknown mass. The magnitude of the gravitational acceleration on the surface of the planet is $8\mathrm{.}00$ m$/$s$.$A$)$ What is the orbital speed of the satellite?B$)$ What is the mass of the planet?C$)$ What is the radius of the planet?D$)$ What is the total mechanical energy of the satellite in its orbit? Take the potential energy to be zero at infinifty.