Answer: A = 5 cm, x eq = 0.
- A A = 5 cm, x<sub>eq</sub> = 0
- B A = 10 cm, x<sub>eq</sub> = 0
- C A = 5 cm, x<sub>eq</sub> = 5 cm
- D A = 2.5 cm, x<sub>eq</sub> = 0
Correct answer: A. A = 5 cm, x<sub>eq</sub> = 0
Explanation: Amplitude = half the range = (5-(-5))/2 = 5 cm. Equilibrium is at the midpoint = 0.
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.