Answer: 20 cm.
- A 20 cm
- B 5 cm
- C 10 cm
- D 40 cm
Correct answer: A. 20 cm
Explanation: In one full period, the particle goes from one extreme to the other and back: 4A = 4 × 5 = 20 cm total distance (not displacement).
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.