Question

two vectors of given magnitude have maximum and minimum resultant equal to 21 and 1 respectively find the magnitude of their resultant when they are placed at 120 degrees with each other

plz answer me fast....​

Answer 1

Explanation:

maximum resultant = A + B = 21

minimum resultant = A- B = 1

2A = 22

A = 11

B = 10

R = ✓( 11² + 10² + 2 x 11 x 10 cos 120⁰)

= √ (121 +100 - 110)

= ✓ (121 -10)

= ✓ (111) m