[Q1] The period $T$ is the time required for the motion to complete one cycle. The problem states this time is 0.75 s.

[Q2] The frequency $f$ is the number of cycles per unit time, which is the reciprocal of the period.

$$f = \frac{1}{T}$$

[Q3] The angular frequency $\omega$ is related to the period $T$ by the following equation:

$$\omega = \frac{2\pi}{T}$$

Substituting the value $T = 0.75$ s into the equations for frequency and angular frequency:

$$f = \frac{1}{0.75 \text{ s}}$$ $$\omega = \frac{2\pi}{0.75 \text{ s}}$$