JEE Main Physics question

Physics Motion in a Plane JEE Main

The resultant of two forces 3P and 2P is R. If the first force is doubled, the resultant is also doubled. The angle between the two forces is

(A)60°
(B)120°Correct
(C)70°
(D)180°

Answer: (B)

Solution

R² = (3P)² + (2P)² + 2(3P)(2P)cosθ = 13P² + 12P²cosθ. When the first force is doubled (6P): (2R)² = (6P)² + (2P)² + 2(6P)(2P)cosθ = 40P² +

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Question ID VK-153291