Answer: velocity is maximum and acceleration is zero.
- A velocity is maximum and acceleration is zero
- B both velocity and acceleration are maximum
- C velocity is zero and acceleration is maximum
- D both are zero
Correct answer: A. velocity is maximum and acceleration is zero
Explanation: At the mean position the restoring force (and acceleration) is zero while the speed is maximum.
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.