Cracking the SAT Physics Subject Test

C = A + B

Cx = Ax + Bx

Cy = Ay + By

To add two or more vectors, resolve each vector into its horizontal and vertical
components. Add the components along the x-axis to form the x-component of the
resultant vector, and then add the components along the y-axis to form the y-
component of the resultant vector. You can use the values for Cx and Cy along with

the Pythagorean theorem to determine the magnitude and direction of the resultant
vector.

Vector Subtraction

To subtract vector B from vector A, use the same procedure. Resolve each vector
into perpendicular components and subtract them in the indicated order.