While there are individuals and families here and there turning to solar for all or part of their energy needs, many corporate entities are also going green in this way. The answer is simple; there is no exact amount you can calculate before estimating how beneficial your property is. It can also be assumed that the angle between the force of the stairs on Ben and Ben's displacement is 0 degrees. By so doing, the stairs would push upward on Ben's body with just enough force to lift his body up the stairs. A common physics lab involves quickly climbing a flight of stairs and using mass, height and time information to determine a student's personal power. It can be assumed that Ben must apply an 800-Newton downward force upon the stairs to elevate his body. A machine that is strong enough to apply a big force to cause a displacement in a small mount of time (i.e., a big velocity) is a powerful machine.