Question

Two vectors AB and BC act on point B at right
angle to each other. The magnitude of their
resultant is 13 and the magnitude of BC is 12,
then the magnitudeof AB is
А 24
B 7
C 5
D 2

Answer 1

Answer:

Explanation:

Given:

C  = A +  B C  .  C  =(  A  +  B  ).(  A  +  B  ) Cto the power2  =A  to the power2 +B  to the power2 +2ABcosθ 13to the power2 =12 to the power  2+5 to the power 2+2(12)(5)cosθ

cosθ=0⇒θ=π/2

Answer 2

Answer:

OPTION C

ANS. 5

Explanation:

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