Question

A 2.83 kg mass attached to an ideal spring oscillates horizontally with an amplitude of 2.64 m. The spring constant is 59.26 N/m. What is the period of the motion? 

Answer 1

$$T=2\pi\sqrt{\dfrac{m}{k}}=2\pi\sqrt{\dfrac{2.83\ kg}{59.26\ \dfrac{N}{m}}}=1.37\ s.$$