A physicist is sent to a small planet to conduct some experiments. He found that: for an object of mass 2 kg, tossed straight upward with an initial speed of 14 m/s, takes 9 seconds to hit the ground. The radius of the planet is 3.18 x 10 m. Based on the data collected: 1. Calculate the magnitude of the gravitational acceleration g on the planet 2. Compute the mass of the small planet 3. If the space craft of the physicist orbits the small planet in a circular path at 30,000 km above the surface of the planet, what is the orbital period of his space craft?