I don't know how to work number 7. I have the answer but we have to figure out how to get it.

the bottom with a speed of 12 m/s. What is the acceleration of gravity g on this planet? l .2 mfg D 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? \\ 3, 0'3- \\ 8i A 1500 kg car starts at rest and sneeds up to 3 m/s with a constant acceleration. If the car (