Anyone know how to do this?

With i really need the correct answer!

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)