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⚛️ Physics  ·  Oscillations  ·  NEET & JEE

In the equation of SHM, x = 10 sin(πt/2) cm. The acceleration when x = 6 cm is:

Answer: -6π²/4 cm/s².

  • A -14.8 cm/s²
  • B -6π²/4 cm/s²
  • C 14.8 cm/s²
  • D -6 cm/s²

Correct answer: B. -6π²/4 cm/s²

Explanation: ω = π/2. a = -ω² x = -(π/2)² × 6 = -6π²/4 ≈ -14.8 cm/s².

Displacement, Velocity, Acceleration in SHMx(t)v(t)a(t)v leads x by 90°; a is exactly out of phase with x (a = −ω²x)

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.

Read the full Oscillations notes →