Motion in a Plane - Result Question 14

16. The angle between two vectors of magnitude 12 and 18 units when their resultant is 24 units, is

(a) 6351

(b) 7552

(c) 8231

(d) 8916

[1999]

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Answer:

Correct Answer: 16. (b)

Solution:

  1. (b) We know that, R2=A2+B2+2ABcosθ (24)2=(12)2+(18)2+2(12)(18)cosθ

cosθ=108432θ=7552



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