Question

The figure here below shows two vectors D1 and D2. Which of the possibilities (a) through (d) is the vector 2D1 + D2?

10

Answer 1

If the figure is the same as here:

then the answer is the following.

1. Let's plot the vector $2D_1$, which is the initial vector just with double length:

2. Now let's find the vector $-2D_1$, which has the same length but opposite diraction with the $2D1$:

3. Finally, let's add the vectors $D_2$ and $-2D_1$ to obtain the given expression. Using the the parallelogram method (see dashed lines):

Thus, the answer seems to be the first one (a).

Answer. a.