The Soyuz carrier rocket monument, which is 50 meters high and 20 units of weight, consists of the intact R-7 11A511 which is fixed on the Space museum building.
The rocket is 50 m height; mass is 20 tones. The monument consists of the intact R-7 11A511 (Soyuz) which is fixed on the Space museum building. In physics, mass is not the same as weight, even though mass is often determined by measuring the object's weight using a spring scale, rather than balance scale comparing it directly with known masses. 
