SSC JE Mechanical Engineering 2017 Set 2 Paper

An object is undergoing simple harmonic motion (SHM) if;
1. The acceleration of the object is directly proportional to its displacement from its equilibrium position.
2. The acceleration is always directed towards the equilibrium position.
$\mathit{a}=-{\left(2\mathrm{\pi }\mathit{f}\right)}^2\mathit{x}$
In this equation; a = acceleration in ms${}^{\mathit{–}2}$, f = frequency in Hz, x = displacement from the central position in m.