• # question_answer A mass of 30 kg is suspended from a spring of spring constant 15 N/m. The time period of vertical oscillations of mass is A)  $\frac{3\pi }{\sqrt{2}}s$                             B)  $2\pi \sqrt{2}\,s$ C)  $\pi \sqrt{2}\,s$            D)         $2\sqrt{2}\,s$

For mass-spring system, time period $T=2\pi \sqrt{\frac{m}{k}}=2\pi \sqrt{\frac{30}{15}}$ $=2\pi \sqrt{2}$second.