Answer: 3/4.
- A 3/4
- B 1/4
- C 1/2
- D 1
Correct answer: A. 3/4
Explanation: PE = (1/2)kx² = (1/2)k(A/2)² = E/4. So KE = E - E/4 = 3E/4. Fraction = 3/4.
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.