My evidence for the claim about mass is that in our expirement, it seems to be a general rule that the more mass a weight has, the higher its GPE and the bigger the crater it left, and the same applies to height. (There are, however, some aberrations. More on those in the errors section below.) For example, when the weight's mass was 10 grams, and being dropped from .5 meters, its GPE was .049 J and it left a crater 0.1 CM deep. When we increased the mass to 20 grams, it had a GPE of 0.98 J and its crater was 0.5 CM. The same goes for height; when a 50 gram weight was dropped from .1 meters, it had a GPE of 0.49 J and left a crater 0.1 CM deep. When the same weight was dropped from 0.2 meters, the GPE increased to 0.98 and the crater was 0.3 CM deep. Here are some graphs of our data; the top one is mass vs. GPE and the bottom graph is height vs. GPE.