Under what conditions would two objects traveling at the same speed have different velocities?

a. one object travels twice as far in twice the time.

b. one object is traveling behind the other.

c. the objects are traveling in opposite directions.

Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.