I have the answer for number 7, now I just need to find out the steps to take to get it.

6) On an unknown airless planet an astronaut drops a 4 kg ball from a 60 m ledge. The mass hits the bottom with a speed of 12 m/s. What is the acceleration of gravity g on this planet? 1. 2 m/S 7) The planet has a twin in an alternate universe with exactly the same acceleration of gravity. The difference is that this planet has an atmosphere. In this case, when dropped from a ledge with the same height, the 4 kg ball hits bottom at the speed of 9 m/s. How much energy is lost to air resistance during the fall? | 30J If the car