Question

Vectors: Consider two vectors A⃗ and B⃗ and their re- sultant A⃗ + B⃗ . The magnitudes of the vectors A⃗ and B⃗ are, respectively, 13.6 and 7.7 and they act at 140◦ to each other.

Find the magnitude of the resultant vector A⃗ + B⃗ .

Answer 1

I don't know why, but I don't really know how to start this question.

Answer 2

There are two ways to do this problem.

1) break vectors A and B into their x,y components. then Cx= Ax + Bx, Cy= Ay+By
the magnitude of the resultant vector C will be sqr(Cx^2 + Cy^2)

Answer 3

2) to add vectors, use "tail to head" and draw the figure