Kinematics Question 32

Question: Two forces 3N and 2 N are at an angle q such that the resultant is R. The first force is now increased to 6N and the resultant become 2R. The value of q is [HP PMT 2000]

Options:

A) 30

B) 60

C) 90

D) 120

Show Answer

Answer:

Correct Answer: D

Solution:

A=3N , B=2N then R=A2+B2+2ABcosθ

R=9+4+12cosθ -(i)

Now A=6N , B=2N then 2R=36+4+24cosθ -(ii)

from (i) and (ii) we get cosθ=12
θ=120



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