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15. If the resultant of two vectors each of magnitude F is also of magnitude F, the angle between them will be _ degrees (A) 30 (B) 60 (C) 90 (D) 120

15. If the resultant of two vectors each of magnitude F is also of magnitude F, the angle between them will be _ degrees
(A) 30
(B) 60
(C) 90
(D) 120

Grade:12th pass

1 Answers

Khimraj
3007 Points
6 years ago
By vector resultant formula
F = [F2 +F2 + 2F*Fcos\Theta]1/2
F2 = 2F2(1+cos\Theta)
cos\Theta = -1/2
\Theta = 120.
Hope it clears. If you like answer then please approve it.

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