STANDARDPhysics-Laws of Motion

STANDARD Physics Equilibrium of Forces MCQ Question

Type: MCQ-conceptual-Medium-Class 11

A body is moving under the action of two forces F₁ = 2î - 5ĵ ; F₂ = 3î - 4ĵ. Its velocity will become uniform under a third force F₃ given by

A

5î - ĵ

B

-5î - ĵ

C

5î + ĵ

D

-5î + 9ĵ

Correct Answer

Option D

Detailed Explanation

For uniform velocity, acceleration is zero. Hence resultant force will be zero. ∴ F₁ + F₂ + F₃ = 0 (2î - 5ĵ) + (3î - 4ĵ) + F₃ = 0 or F₃ = (-5î + 9ĵ)

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