I need help solving this problem on my homework that I’ve been stuck on

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.

Pe = 1/2k(x)^2  and .05n/m = .05x10^-9m = x 

Ithink the answer is fusion