Answer: A√3.
- A A√3
- B A√2
- C 2A
- D A
Correct answer: A. A√3
Explanation: Resultant amplitude = √(A² + A² + 2A²cos(π/3)) = A√(2 + 2×1/2) = A√3.
In SHM, displacement and velocity are 90° out of phase (v is maximum when x=0, and zero when x is extreme), while acceleration is always exactly opposite in sign to displacement, consistent with a = −ω²x.
Concept context
Simple harmonic motion, spring-mass, pendulum, energy in SHM, and resonance.