Question

A block attached to a spring oscillates in simple harmonic motion along the x-axis between the two extremes, x = 10 cm and x = 30 cm. The block goes from one extreme to the other in 0.25 s. Its amplitude and frequency are:

Answer 1

The frequency:

$$f=1/(2·0.25)=2\text{ Hz}.$$

The amplitude:

$$A=\frac{x_2-x_1}{2}=10\text{ cm}.$$