I am developing a new product. I am currently constructing various prototypes of the product changing only one component using a different material with each model. I want to test the impact results of each different model dropping a consistent weight (i.e. 20lbs) from a consistent height (i.e. 10’) for each test so video these results to determine which model will best suit my needs. So, this sounds like a simple question, dropping 20lbs from 20’, what will be the velocity at impact? And is there a simple formula I can use if I change the variables?