Experts tell me that: "At average gravity on Earth (conventionally, g = 9.80665 m/s2), a kilogram mass exerts a force of about 9.8 newtons. An average-sized apple exerts about one newton of force, which we measure as the apple's weight.. After one second, you're falling 9.8 m/s.. .. falling from 50m high is the equivalent of getting hit by a car going 112 km/h, 31m/sec." - This means that a mass at rest = the mass falling 5 meters. Falling 50meters gives 3 times the force on impact. I want to replicate a force of mass 1kg at 44m/sec , as in a fall from 100 meters , by placing mass at rest. Is this a) 5kg at gravity b) 800 kg at gravity ? or c) drop 4.5kg for 5 meters ?