A12,000 kg railroad car is traveling at 2 m/s when it strikes another 10,000 kg railroad car that is at rest. if the cars lock together, what is the final speed of the two

answer and explanation;

composition refers to both the types of minerals within a rock and the overall chemical makeup of the rock while texture refers to the size and arrangement of the minerals or grains that make up a rock. both composition and texture can be used to classify rocks, such as igneous rocks. texture describes how the rock became solid or crystallized from liquid, melted rock. composition of a rock describes the minerals that make up a particular rock.

Sorry i don’t know what to do