Answer: decreases.
- A decreases
- B increases
- C remains unchanged
- D becomes zero
Correct answer: A. decreases
Explanation: Effective gravity becomes g + a, so T = 2π√(L/(g+a)) decreases.
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.