We have a 20 pound weight and a scale on the surface of Earth that we will take on this trip. We have a space ship that has a new engine that accelerates particles of matter to propel it self and can accelerate for years if necessary. We blast into orbit around earth and are traveling 17000 miles per hour. Alpha Centauri, 4.3 light-years from Earth is our destination. The engine is turned on and using our 20 pound weight and a scale we accelerate at a constant 32 feet per se...