—second law of newton

where did the “2a” come from in the first equation?

i know that frictional force is equal to “normal force x coeficient of friction” but the problem is with that number 2 on left side.

Find the vertex(use the completing the square method), findthe x- and y-intercepts, and sketch the graph offunction. y = 2x2 + 4x - 1

Avalue that describes how heavy an object is and is related to the force of gravity is

Which statement best describes copper? a. it has a low resistance and prevents charges from moving freely. b it has a high resistance and allows charges to move freely. c. it has a high resistance and prevents charges from moving freely. d. it has a low resistance and allows charges to move freely