Question

Angle between two vectors of magnitudes 12 and
18 units, when their resultant is 24 units is
(1) 82 31
(2) 63°51'
(3) 89°16
(4) 75°52​

Answer 1

Answer:

right answer is fourth one 75°52

Explanation:

according to the formula

r^2=a^2+b^2+2*a*b*cos(angle)

in this question r=24 ; a=12 ; b=18

after putting these values in the formula you will get

cos(angle)= 1/4 = 0.25

therefore, angle = 75°52