Question

How does multiplying a vector by a scalar value of -pi / 4 change the vector?

Answer 1

The vector will change in direction and decrease in magnitude

Explanation:

Given:

vector multiplication by -π/4

-π/4= -0.785

Due to the negative sign "-", the, vector will change/reverse its direction.

And as of the magnitude, 0.785<1 hence the magnitude of vector will be decreased by this factor !