Question

Given u = 35i − 12j, what are the magnitude and direction of −3u? Round to the nearest whole number.

37; 109°
37; 289°
111; 161°
111; 341°

Answer 1

(c) (111; 161°)

Explanation:

The given vector (u) is a 4th-quadrant vector with a magnitude just over 35 units. A vector 3 times that length in the opposite direction (-3u) will be one with a magnitude close to 111 in the 2nd-quadrant.

(111; 161°)