Practice question

**Mass-spring dynamics** show T depends on mass and stiffness, independent of amplitude for ideal spring. Given T and m, k = 4π² m/T² extracted, and energy E = ½ k A² connects amplitude to total mechanical energy, illustrating isochronism. Angular frequency: ω = √((k/m)) = √((720/1.8)) = √(400) = 20 rad/s . Frequency: v = (ω/2π) = (20/2 × 3.14) ≈ 3.18 Hz . Applying x = A cos(ωt + φ), v = -ωA sin(ωt + φ), a = -ω²x and E = ½kA² = ½mω²A², result 3.18 Hz follows, reflecting SHM dependence on amplitude A, ω and system parameters.