A cell phone weighing 80 grams is flying through the air at 15 m/s what is the kinetic energy?

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.

Lexy is correct because angle r is between the incident wave,  n  = 0, and a diffracted wave.