Question

44
The magnitudes of vectors Ā, B and C are 3, 4
and 5 units respectively. If Ā + B = 7, the
angle between A and B is:
A. 1/2
-1
B. cos' 0.6
C. tan 7/5
D. 1/4​

Answer 1

Answer:

0 degree

Explanation:

a

${a}^{2} + {b}^{2} + 2ab \cos( \alpha ) = resultant$

so 25 + 16 + 24 cos alpha = 49

=> 24cos alpha = 24

=> cos alpha = 1

=> alpha = 0 degreed. So the options are incorrect