Question

The magnitude of vectors A,B and C are 3,4 and 5 respectively if A+B=C the angle between A and B is?
Please give expalanation

Answer 1

Answer:

Let

x

ˉ

=30 units

B

ˉ

=44 unit

c

ˉ

=5 units

A+B=C

′

squaring m both side

(A+B)

2

=C

2

=1

A

2

+B

2

+2ABcosθ=C

2

3

2

+4

2

+2×3×4cosθ=5

2

24cosθ=25−25

cosθ=0/2

cosθ=0

θ=cos

−1

(0)=90

o

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