Answer: 0.1 s.
- A 0.2 s
- B 0.1 s
- C 0.3 s
- D 0.6 s
Correct answer: B. 0.1 s
Explanation: With x = A sin(ωt), x = A/2 gives ωt = π/6, so t = T/12 = 1.2/12 = 0.1 s.
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.