Answer: k1 + k2.
- A k1 + k2
- B k1 k2/(k1+k2)
- C k1 - k2
- D (k1 + k2)/2
Correct answer: A. k1 + k2
Explanation: Springs in parallel: keff = k1 + k2 (both springs stretch/compress by the same amount). In series: 1/keff = 1/k1 + 1/k2.
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.