Question

PLSS HELPPP!! Given vector u equals 15 times open angled bracket cos 45 degrees comma sin 45 degrees close angle bracket comma what are the magnitude and direction of −5u?

75; 225°
75; 135°
−75; −135°
−75; 45°

Answer 1

-75;45

Explanation:

To start, it cant be a or b since we are multiplying a positive U times -5, therefore making it negative

-5(15)

-75

then, to find the answer u need to find the right formula

tan(v2/v1) or tan^-1(v2/v1)

for this it is the inverse tangent (tan^-1)

so you have to plug the values in

=tan^-1(sin45/cos45)

which then would equal 45

Answer 2

The answer to your question is the 2 one